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

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,

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

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