We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Some add-ons are missing in the tools menu and / or modules and navigation bar

  • 5 replies
  • 4 have this problem
  • 1 view
  • Last reply by cor-el

more options

I am running Firefox 20 FRENCH (this is maybe important as all of this below does not appear with the EN version...) on MacOSX 10.6.8.

Symptoms : - Web Developer toolbar not displayed anymore. - Xmarks add-ons not displayed in the module bar. - Icons of other add-ons displayed in the navigation bar ONLY after the first firefox opening i.e. just after system restart. If firefox is closed and re-opened, all the add-ons icons are lost.

> All the add-ons are installed in tha add-on menu. > This behavior only appear with the FRENCH versions of firefox (tried 19.0.2 and 20). > Installed the 19.0.2 ENGLISH version and all is OK !!!

Fixes attempts (tried almost everything...) : - Reset firefox profile and restart with a new one : no effect (after I have reinstalled all the add-ons one by one...) - Uninstall Firefox (with profiles folder, cache folders, etc...) then reinstall : no effect - The only thing that is working is using the ENGLISH version...

This is really annoying because as a web developer I really need the Web Developer extension. Does anyone has an idea of how to fix this ?

Thank you very much for your help ! Regards,

I am running Firefox 20 FRENCH (this is maybe important as all of this below does not appear with the EN version...) on MacOSX 10.6.8. Symptoms : - Web Developer toolbar not displayed anymore. - Xmarks add-ons not displayed in the module bar. - Icons of other add-ons displayed in the navigation bar ONLY after the first firefox opening i.e. just after system restart. If firefox is closed and re-opened, all the add-ons icons are lost. > All the add-ons are installed in tha add-on menu. > This behavior only appear with the FRENCH versions of firefox (tried 19.0.2 and 20). > Installed the 19.0.2 ENGLISH version and all is OK !!! Fixes attempts (tried almost everything...) : - Reset firefox profile and restart with a new one : no effect (after I have reinstalled all the add-ons one by one...) - Uninstall Firefox (with profiles folder, cache folders, etc...) then reinstall : no effect - The only thing that is working is using the ENGLISH version... This is really annoying because as a web developer I really need the Web Developer extension. Does anyone has an idea of how to fix this ? Thank you very much for your help ! Regards,

Chosen solution

Dear iamjayakumars,

Thank you for your contribution but I had already checked and all my add-ons are listed using the about:addons command.

In the meantime I have found this link for Web Developer. Just have to wait for an update...

Thank you again.

Read this answer in context 👍 0

All Replies (5)

more options

Check the installed addons are showing in the Addons

Type about:addons in Addressbar

  • check the installed addons in Extensions
more options

Chosen Solution

Dear iamjayakumars,

Thank you for your contribution but I had already checked and all my add-ons are listed using the about:addons command.

In the meantime I have found this link for Web Developer. Just have to wait for an update...

Thank you again.

more options

Does it have any effect if you change the general.useragent.locale pref to en-US ?

more options

YES ! this also solve the problem... thank you !

more options

Note that this will effect other extensions and themes as well (you force a different locale), so restore this pref to the default as soon as the Web Developer toolbar gets an update that fixes this.

See also: