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Why does spell check suddenly flag every word?

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All of a sudden, starting today, the Firefox spell checker flags every word I type as incorrect, despite being set to the language "English (United States)". Is there a way to see if the dictionary is corrupted or broken in some way? I checked persdict.dat in my profile folder, but nothing there looks odd (just a few names I use often). This happens on all web sites, in all forms that check spelling.

All of a sudden, starting today, the Firefox spell checker flags every word I type as incorrect, despite being set to the language "English (United States)". Is there a way to see if the dictionary is corrupted or broken in some way? I checked persdict.dat in my profile folder, but nothing there looks odd (just a few names I use often). This happens on all web sites, in all forms that check spelling.
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Réiteach roghnaithe

I was able to fix this by reinstalling the app, keeping my profile. So the problem must have been with the dictionary in the program folder, rather than the personal dictionary in the profile folder.

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You can try to reset the spellchecker.dictionary pref on the about:config page via the right-click context menu to see if that helps.

Do you still have the dictionary installed in the dictionaries folder in the Firefox program folder or in the Firefox profile folder in case your locale doesn't come with a dictionary and you have installed one?

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Réiteach Roghnaithe

I was able to fix this by reinstalling the app, keeping my profile. So the problem must have been with the dictionary in the program folder, rather than the personal dictionary in the profile folder.