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Firefox issues
Main processes
As seen in top
- GeckoMain
- Isolated Web Co
- Privileged Cont
- Web Content
- WebExtensions
Firefox will not start
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.
Firefox will not update
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
Restart to Keep Using Firefox
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.
Multimedia
Hight CPU load
Have a look at the Remote Data Decoder (RDD)
libavcodec
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
Youtube sound level is too low
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
Pulseaudio high CPU load
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)
Useful links
/etc/pulse/daemon.conf tweaks
Date and time format
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
pingsender
This program sends telemetry data to Firefox
System lockup
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
Tabs not restored
See this page
The folder is: /home/user/.mozilla/firefox/hash.default/sessionstore-backups
No tabs until restart
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
No favicon in bookmark or tab
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
An error occurred!
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
Do not start, keep version 56.0.2 until further notice
Firefox was probably started as root
Downgrade version
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
Freezes
Version 120 freezes the whole Linux PC. Only the mouse pointer can be moved.
Tab loading
Version 120, before 120 and maybe after 120: Tabs which should not load load and ask for the master password.
Updates do not update
Updates do not update, 120 → 120.0.1
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