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• Isolated Web Co
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• WebExtensions

Error message:

Firefox cannot use the profile "default" because it is in use
To continue, close the running instance of Firefox or choose a different profile.

Possible reasons:

• the files have user root and group root, aka the user was not the owner
• lock, parentlock and .parentlock files can be present. Remove them and start firefox agrain.

Check if any domains are blocked by a DNS proxy like Pi-hole

• aus5.mozilla.org : should be whitelisted
• content-signature-2.cdn.mozilla.net : T.b.d.
• detectportal.firefox.com : T.b.d.
• firefox.settings.services.mozilla.com : T.b.d.
• firefox.settings.services.mozilla.com : T.b.d.

This might be a solution:

• Close Firefox
• Login in a terminal as root
• Start Firefox by entering firefox and pressing Enter
  • If you get GConf-WARNING warnings, dbus-launch firefox can be used to avoid them
• Update Firefox
• Restart Firefox
• Close Firefox
• Start Firefox as a normal user

This annoyance occurs after you have updated Firefox, so you do not forget to update, via Help > About Firefox but did not want to restart Firefox because that is not convenient. Restarting will be done at the next reboot of the computer. The message is shown if you want to open a URL in a (new) tab. You can only continue after you have restarted Firefox.

If you paste an URL over the URL in an existing tab the original URL will get lost. There is no back option as long as you do not restart Firefox.

Have a look at the Remote Data Decoder (RDD)

If a libavcodec is vulnerable or not supported message appears you can still use it if you set in about:config

media.libavcodec.allow-obsolete

to true. This can be a security risk. More on libavcodec may be vulnerable message in Firefox

The solution: In about:config search for and change the default to the new value

• media.default_volume default: 1.0 new: 100 or according to your needs
• media.volume_scale default: 1.0 new: 1.0

Use trial an error by changing the media.default_volume value until you get the desired level
Leave media.volume_scale at its default otherwise unmuting does not work until your (re)wind the Youtube video a bit

Firefox can make the pavucontrol and pulsaudio programs have a high CPU load
Solution: t.b.d. (maybe, if feasable, close all tabs which have played audio or have a page open which could play audio)

/etc/pulse/daemon.conf tweaks

The time format is in 12 hour (AM / PM) format in stead of 24 hour format
This can be solved by setting the

intl.regional_prefs.use_os_locales

to true in about:config

This program sends telemetry data to Firefox

Firefox can lockup the computer to the point a hard reset is needed.
On other occasions the mouse locks up. Possible solution: In a terminal do CTRL-ALT-F1 followed by CTRL-ALT-F7

See this page
The folder is: /home/user/.mozilla/firefox/hash.default/sessionstore-backups

It is not possible to use new or existing tabs, except for pinned tabs. This message appears:

Restart to Keep Using Firefox

An update to Firefox started in the background. You’ll need to restart to finish the update.

Your windows and tabs will be quickly restored, but private ones will not.

                                                                   Restart Firefox button

Solution:

• Close Firefox
• Open the favicon.sqlite database using sqlitebrowser
• Find the favicon(s) you want to remove
• Delete them
• Save the database
• Exit sqlitebrowser
• Start Firefox
• Open the page in a new tab
• The favicon should show up in the tab

This did not work for us on Firefox 109.0.1

When opening a link OTRS:

An error occurred! Please check the browser error log for more details!

It is not clear what is ment with the 'browser error log'. A search on the Internet did not yield any results.
Solution: Check your addons. For us CanvasBlocker was the cause.

Do not start, keep version 56.0.2 until further notice

Firefox was probably started as root

When Firefox is a Beta version and you want to go back to the Desktop (Release channel) version do (replace the version number with the actual Release channel versionnumber; replace the directories with the actual directories):

• download the Release channel version
• as root find and move the tar.bz2 file to /opt
• as root: tar vxf firefox-111.0.tar.bz2 --directory=/opt/firefoxDesktop/
• as user one of:
  • /opt/firefoxDesktop/firefox/firefox -P --allow-downgrade
  • /opt/firefoxDesktop/firefox/firefox --profile /home/user/.mozilla/firefox/hashhash.default --allow-downgrade (replace hashhash and default with the real strings)
• close firefox
• start firefox in the normal way: /opt/firefoxDesktop/firefox/firefox --profile /home/user/.mozilla/firefox/hashhash.default --no-remote
• check the version via: Help > About

FirefoxDesktop is the directory where the Desktop version of Firefox is installed

Information about the version can be found via
/opt/firefoxDesktop/firefox/firefox --version
or via
cat /opt/firefoxDesktop/firefox/defaults/pref/channel-prefs.js | grep app.update.channel | cut -d '“' -f 4

Also in some files in the profile version information can be found

compatibility.ini
prefs.js

Version 120 freezes the whole Linux PC. Only the mouse pointer can be moved.

Version 120, before 120 and maybe after 120: Tabs which should not load load and ask for the master password.

Updates do not update, 120 → 120.0.1

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