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Firefox Developer Edition. Get the Firefox browser built just for developers. Check out the home for web developer resources. Firefox Reality. Explore the web with the Firefox browser for virtual reality. Donate your voice so the future of the web can hear everyone. In the next few weeks, uBlock Origin will be the first add-on to become available in the new Firefox for Android. It is currently available on Firefox Preview Nightly and will soon be available on Firefox for Android Nightly.
Firefox was created by Dave Hyatt and Blake Ross as an experimental branch of the Mozilla browser, first released as Firefox 1.0 on November 9, 2004. Starting with version 5.0, a rapid release cycle was put into effect, resulting in a new major version release every six weeks.This was gradually accelerated further in late 2019, so that new major releases occur on four-week cycles starting in 2020. Firefox 87 new default Referrer Policy ‘strict-origin-when-cross-origin' trimming user sensitive information like path and query string to protect privacy. Starting with Firefox 87, we set the default Referrer Policy to ‘strict-origin-when-cross-origin' which will trim user sensitive information accessible in the URL. Firefox was created by Mozilla as a faster, more private alternative to browsers like Internet Explorer, and now Chrome. Today, our mission-driven company and volunteer community continue to put your privacy above all else. Your privacy comes first.

As part of the 2014 Volatility Plugin Contest, I created 3 plugins for locating Firefox browser history related artifacts:
They are all in the firefoxhistory.py module found on my volatility-plugins repo on GitHub. They also depend on the sqlite_help.py module in the same location, which provides some useful functions for manipulating data in SQLite databases. Firefox and Chrome both store history and browsing data in SQLite databases. Depending on the number and type of fields in each table, certain values can be expected in certain positions, which allows us to locate records of a given table.
A sample memory image is available at voltest.zip, and the corresponding places.sqlite and cookies.sqlite from that image are at ff_places and ff_cookies, respectively, for comparison with the plugin output. The firefoxdownloads plugin only works on Firefox 25 and earlier because the downloads.sqlite file was removed. I don't have a memory image to provide but will show sample output from parsing a downloads.sqlite file below. The download data was moved into another table ('moz_annos' in places.sqlite) that I haven't worked on yet. However, the download URLs are typically in the firefoxhistory output anyway. The plugin has been run against the SQLite databases in version 25 and memory samples of a system with version 31, so I'd expect it to work on at least those versions and the ones in between.
Like the core Volatility module iehistory, this module adds similar functionality for Firefox browsing history. It can print output in the default table format or in CSV or bodyfile format. This is useful for combining with other plugins to create a timeline. According to W3Schools, Firefox and Chrome make up about 85% of the browser share as of July 2014, so this and my other plugin in the contest help round out Volatility's browser coverage.
Usage and output for the plugins is below.
firefoxhistoryThe firefoxhistory plugin extracts records from the Firefox moz_places table in the places.sqlite SQLite database file. It supports –output=csv and –output=body to print in CSV and bodyfile format, respectively. The full output from the sample image is copied below with all 31 records that are in the ff_places database linked to above, showing the plugin was able to locate them all. The output contains, among other fields, the URL, page title, number of visits, and the last visit date. The URL may occasionally be truncated, but the full URL can be displayed in CSV format. In addition, the last visit date timestamp is used in the bodyfile.
firefoxcookiesThe firefoxcookies plugin extracts records from the Firefox moz_cookies table in the cookies.sqlite SQLite database file. It supports –output=csv and –output=body to print in CSV and bodyfile format, respectively. Just a snippet of the output is pasted below because, while the limited browsing in the test image created only 31 history entries, there are hundreds of cookies. The output contains, among other fields, the domain, cookie name, path, and cookie value, though the value is often truncated in table format. It's fully displayed in the CSV format. In addition, there are three timestamps for the creation time, last accessed time, and expiration time. These are all printed, and also included in the bodyfile for timeline generation.
firefoxdownloadsThe firefoxdownloads plugin extracts records from the Firefox moz_downloads table in the downloads.sqlite SQLite database file. The downloads.sqlite file was removed in Firefox 26. This data was moved into the moz_annos table in places.sqlite. A quick look at this table looks like it should be locatable; however, I haven't worked on it yet. The test image that was provided has Firefox 31 installed so this plugin will not locate download records. However, I did have an old downloads.sqlite file that I built the plugin off of and it extracts all the records from the actual database file, so it should work on a memory image with the applicable version installed. The output below is an excerpt from running the plugin against that database file.
It supports –output=csv and –output=body to print in CSV and bodyfile format, respectively. The output contains, among other fields, the filename, source URL, target path being saved to, and bytes downloaded. In addition, there are timestamps for the start and end times of the download. These are both printed, and also included in the bodyfile for timeline generation.
Warning: Firefox now includes downgrade protection to prevent corruption of user profile data. If you install an older version, you'll be prompted to create a new Firefox profile.
If there is a problem with a new version of Firefox, some people may want to downgrade Firefox to a previous version but we do not recommend this. The latest Firefox version includes security updates so downgrading to an older version leaves you more vulnerable to attacks and usually doesn't fix the problem. This article gives you some alternatives to downgrading and links to older versions of Firefox if you do choose to downgrade.
Table of ContentsProblems with an update are usually not caused by the new version of Firefox, but rather the update process. In most cases, installing a previous version will not help. Instead, see:
Note: Other problems can be solved with the Refresh Firefox feature. It restores Firefox to its default state while saving your essential information.
Ensure all security and security-related software is fully updated. Some security software will need to be upgraded to a new version so that it is compatible with each Firefox version update. 
Optional software bundled with security software also may need updating. Such software may not be essential for your security but, if outdated, may interfere with the use of Firefox or cause Firefox to crash.
If you still want to downgrade, you can visit Mozilla's directory of older Firefox versions using the links below. Please note, however, that using older versions can make Firefox insecure and more vulnerable to attacks and scams. We recommend that you always use the newest version of Firefox. Warning: Old Firefox versions pose a significant security risk.
Firefox 77.0.132-bit (US English)
Firefox 77.0.164-bit (US English)
Firefox 77.0.132-bit (US English)
Firefox 77.0.164-bit (US English)
Firefox 78.0.232-bit (US English)
Firefox 78.0.264-bit (US English)
Firefox 78.0.232-bit (US English)
Firefox 78.0.264-bit (US English)

Firefox 79.032-bit (US English)
Firefox 79.064-bit (US English)

Firefox 79.032-bit (US English)
Firefox 79.064-bit (US English)
Firefox 80.0.132-bit (US English)
Firefox 80.0.164-bit (US English)
Firefox 80.0.132-bit (US English)
Firefox 80.0.164-bit (US English)

Firefox 81.0.232-bit (US English)
Firefox 81.0.264-bit (US English)
Firefox 81.0.232-bit (US English)
Firefox 81.0.264-bit (US English)
Firefox 82.0.332-bit (US English)
Firefox 82.0.364-bit (US English)
Firefox 82.0.332-bit (US English)
Firefox 82.0.364-bit (US English)
Firefox 83.032-bit (US English)
Firefox 83.064-bit (US English)
Firefox 83.032-bit (US English)
Firefox 83.064-bit (US English)
Firefox 84.0.232-bit (US English)
Firefox 84.0.264-bit (US English)
Firefox 84.0.232-bit (US English)
Firefox 84.0.264-bit (US English)
Ublock Origin Firefox FacebookFirefox 85.0.232-bit (US English)
Firefox 85.0.264-bit (US English)
Firefox 85.0.232-bit (US English)
Firefox 85.0.264-bit (US English)
Firefox 86.0.132-bit (US English)
Firefox 86.0.164-bit (US English)
Firefox 86.0.132-bit (US English)
Firefox 86.0.164-bit (US English)
Ublock Origin Firefox ExtensionFirefox 87.032-bit (US English)
Firefox 87.064-bit (US English)
Firefox 87.032-bit (US English)
Firefox 87.064-bit (US English)
Important: By default, Firefox is set for automatic updates. To prevent Firefox from automatically updating itself after you install an older version, you'll need to change your Firefox update settings: In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button and select ... In the General panel, go to the Firefox Updates section.
Instead of downgrading to an older, insecure version of Firefox and changing your update settings, you should consider these alternatives:

Firefox Developer Edition. Get the Firefox browser built just for developers. Check out the home for web developer resources. Firefox Reality. Explore the web with the Firefox browser for virtual reality. Donate your voice so the future of the web can hear everyone. In the next few weeks, uBlock Origin will be the first add-on to become available in the new Firefox for Android. It is currently available on Firefox Preview Nightly and will soon be available on Firefox for Android Nightly.
Firefox was created by Dave Hyatt and Blake Ross as an experimental branch of the Mozilla browser, first released as Firefox 1.0 on November 9, 2004. Starting with version 5.0, a rapid release cycle was put into effect, resulting in a new major version release every six weeks.This was gradually accelerated further in late 2019, so that new major releases occur on four-week cycles starting in 2020. Firefox 87 new default Referrer Policy ‘strict-origin-when-cross-origin' trimming user sensitive information like path and query string to protect privacy. Starting with Firefox 87, we set the default Referrer Policy to ‘strict-origin-when-cross-origin' which will trim user sensitive information accessible in the URL. Firefox was created by Mozilla as a faster, more private alternative to browsers like Internet Explorer, and now Chrome. Today, our mission-driven company and volunteer community continue to put your privacy above all else. Your privacy comes first.

As part of the 2014 Volatility Plugin Contest, I created 3 plugins for locating Firefox browser history related artifacts:
They are all in the firefoxhistory.py module found on my volatility-plugins repo on GitHub. They also depend on the sqlite_help.py module in the same location, which provides some useful functions for manipulating data in SQLite databases. Firefox and Chrome both store history and browsing data in SQLite databases. Depending on the number and type of fields in each table, certain values can be expected in certain positions, which allows us to locate records of a given table.
A sample memory image is available at voltest.zip, and the corresponding places.sqlite and cookies.sqlite from that image are at ff_places and ff_cookies, respectively, for comparison with the plugin output. The firefoxdownloads plugin only works on Firefox 25 and earlier because the downloads.sqlite file was removed. I don't have a memory image to provide but will show sample output from parsing a downloads.sqlite file below. The download data was moved into another table ('moz_annos' in places.sqlite) that I haven't worked on yet. However, the download URLs are typically in the firefoxhistory output anyway. The plugin has been run against the SQLite databases in version 25 and memory samples of a system with version 31, so I'd expect it to work on at least those versions and the ones in between.
Like the core Volatility module iehistory, this module adds similar functionality for Firefox browsing history. It can print output in the default table format or in CSV or bodyfile format. This is useful for combining with other plugins to create a timeline. According to W3Schools, Firefox and Chrome make up about 85% of the browser share as of July 2014, so this and my other plugin in the contest help round out Volatility's browser coverage.
Usage and output for the plugins is below.
firefoxhistoryThe firefoxhistory plugin extracts records from the Firefox moz_places table in the places.sqlite SQLite database file. It supports –output=csv and –output=body to print in CSV and bodyfile format, respectively. The full output from the sample image is copied below with all 31 records that are in the ff_places database linked to above, showing the plugin was able to locate them all. The output contains, among other fields, the URL, page title, number of visits, and the last visit date. The URL may occasionally be truncated, but the full URL can be displayed in CSV format. In addition, the last visit date timestamp is used in the bodyfile.
firefoxcookiesThe firefoxcookies plugin extracts records from the Firefox moz_cookies table in the cookies.sqlite SQLite database file. It supports –output=csv and –output=body to print in CSV and bodyfile format, respectively. Just a snippet of the output is pasted below because, while the limited browsing in the test image created only 31 history entries, there are hundreds of cookies. The output contains, among other fields, the domain, cookie name, path, and cookie value, though the value is often truncated in table format. It's fully displayed in the CSV format. In addition, there are three timestamps for the creation time, last accessed time, and expiration time. These are all printed, and also included in the bodyfile for timeline generation.
firefoxdownloadsThe firefoxdownloads plugin extracts records from the Firefox moz_downloads table in the downloads.sqlite SQLite database file. The downloads.sqlite file was removed in Firefox 26. This data was moved into the moz_annos table in places.sqlite. A quick look at this table looks like it should be locatable; however, I haven't worked on it yet. The test image that was provided has Firefox 31 installed so this plugin will not locate download records. However, I did have an old downloads.sqlite file that I built the plugin off of and it extracts all the records from the actual database file, so it should work on a memory image with the applicable version installed. The output below is an excerpt from running the plugin against that database file.
It supports –output=csv and –output=body to print in CSV and bodyfile format, respectively. The output contains, among other fields, the filename, source URL, target path being saved to, and bytes downloaded. In addition, there are timestamps for the start and end times of the download. These are both printed, and also included in the bodyfile for timeline generation.
Warning: Firefox now includes downgrade protection to prevent corruption of user profile data. If you install an older version, you'll be prompted to create a new Firefox profile.
If there is a problem with a new version of Firefox, some people may want to downgrade Firefox to a previous version but we do not recommend this. The latest Firefox version includes security updates so downgrading to an older version leaves you more vulnerable to attacks and usually doesn't fix the problem. This article gives you some alternatives to downgrading and links to older versions of Firefox if you do choose to downgrade.
Table of ContentsProblems with an update are usually not caused by the new version of Firefox, but rather the update process. In most cases, installing a previous version will not help. Instead, see:
Note: Other problems can be solved with the Refresh Firefox feature. It restores Firefox to its default state while saving your essential information.
Ensure all security and security-related software is fully updated. Some security software will need to be upgraded to a new version so that it is compatible with each Firefox version update. 
Optional software bundled with security software also may need updating. Such software may not be essential for your security but, if outdated, may interfere with the use of Firefox or cause Firefox to crash.
If you still want to downgrade, you can visit Mozilla's directory of older Firefox versions using the links below. Please note, however, that using older versions can make Firefox insecure and more vulnerable to attacks and scams. We recommend that you always use the newest version of Firefox. Warning: Old Firefox versions pose a significant security risk.
Firefox 77.0.132-bit (US English)
Firefox 77.0.164-bit (US English)
Firefox 77.0.132-bit (US English)
Firefox 77.0.164-bit (US English)
Firefox 78.0.232-bit (US English)
Firefox 78.0.264-bit (US English)
Firefox 78.0.232-bit (US English)
Firefox 78.0.264-bit (US English)
Firefox 79.032-bit (US English)
Firefox 79.064-bit (US English)
Firefox 79.032-bit (US English)
Firefox 79.064-bit (US English)
Firefox 80.0.132-bit (US English)
Firefox 80.0.164-bit (US English)
Firefox 80.0.132-bit (US English)
Firefox 80.0.164-bit (US English)
Firefox 81.0.232-bit (US English)
Firefox 81.0.264-bit (US English)
Firefox 81.0.232-bit (US English)
Firefox 81.0.264-bit (US English)
Firefox 82.0.332-bit (US English)
Firefox 82.0.364-bit (US English)
Firefox 82.0.332-bit (US English)
Firefox 82.0.364-bit (US English)
Firefox 83.032-bit (US English)
Firefox 83.064-bit (US English)
Firefox 83.032-bit (US English)
Firefox 83.064-bit (US English)
Firefox 84.0.232-bit (US English)
Firefox 84.0.264-bit (US English)
Firefox 84.0.232-bit (US English)
Firefox 84.0.264-bit (US English)
Ublock Origin Firefox FacebookFirefox 85.0.232-bit (US English)
Firefox 85.0.264-bit (US English)
Firefox 85.0.232-bit (US English)
Firefox 85.0.264-bit (US English)
Firefox 86.0.132-bit (US English)
Firefox 86.0.164-bit (US English)
Firefox 86.0.132-bit (US English)
Firefox 86.0.164-bit (US English)
Ublock Origin Firefox ExtensionFirefox 87.032-bit (US English)
Firefox 87.064-bit (US English)
Firefox 87.032-bit (US English)
Firefox 87.064-bit (US English)
Important: By default, Firefox is set for automatic updates. To prevent Firefox from automatically updating itself after you install an older version, you'll need to change your Firefox update settings: In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button and select ... In the General panel, go to the Firefox Updates section.
Instead of downgrading to an older, insecure version of Firefox and changing your update settings, you should consider these alternatives:
Origin FirefoxInstall Firefox Extended Support Release.Firefox Extended Support Release (ESR) is an official version of Firefox developed for large organizations such as universities and businesses. Firefox ESR does not come with the latest features, but it does have the latest security and stability fixes. For more information, see the article Switch to Firefox Extended Support Release (ESR) for personal use.
U Origin FirefoxUse the latest version of another browser. If you are not satisfied with the current Firefox version or it simply is not working right now, there are alternative browsers that you can use to browse the web.