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Firefox external dictionaries broken

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It used to be that you could drop dictionaries in $INSTALLDIR/dictionaries and they would be used. As of Firefox 62, Mozilla started putting the default dictionary in omni.ja and sometime later started ignoring the $INSTALLDIR/dictionaries directory.

But, supposedly, we can still point to external dictionaries by either setting the $DICPATH environment variable to point to a directory that contains a hunspell dictionary (en-US.aff en-US.dic) set and it would be seen and used by Firefox. OR we can set the spellchecker.dictionary_path preference.

I am running vanilla Firefox 78.3.0 ESR under Linux and neither of the above options is working (also not working in Firefox 68ESR). I have a customized medical dictionary that I have used for many years under older versions of Firefox that I now cannot use. I am hoping someone might have some idea what is going on. Is this option now broken? And I using it wrong?

$ ls /opt/dictionary en-US.aff en-US.dic $ export DICPATH="/opt/dictionary" $ firefox

I then check for a word that I know is only in the /opt/dictionary file (in this case, "algin") and it is still showing it as misspelled, so it is not using the external dictionary I defined. I tried also adding export DICTIONARY="en-US" before launching and that didn't help.

Previous research:


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Still trying to find a resolution. Tested now in FF 82 and also on different systems and it still doesn't work. Isn't anyone else having this problem?

I ended up opening a bug report:


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