Ubuntu Start Page in Firefox Language changed suddenly

Solution 1:

Looks similar to these:

• http://ubuntuforums.org/showthread.php?t=1669853
• http://ubuntuforums.org/showthread.php?t=1352219

Try typing in about:config into the url bar, then adjusting this:

intl.accept_languages

Solution 2:

I was also affected by this problem. The only language support I have installed is English and there was no change to menus, just the firefox about:start page (default home page). The problem persisted after a reboot.

I opened System Settings->Language Support to check for any changes on the Language tab and found none.

I switched to the Regional Formats tab and all was set as expected:

I clicked the Apply Systemwide button and the problem disappeared and didn't reappear after a reboot.