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This question already exists in this forum. 1: It's archived, so I need to re-ask to comment 2: Using the full subject of this question as a search on this forum does NOT find the article

...however it is the top match when searching for that subject is google.

...and the answer is:

<Thunderbird profile location>/persdict.dat

(If you don't know where your profile directory is, use Help->"Troubleshooting information" )

I am trying to disable the default el-GR dictionary of Firefox I try through setting without luck. Also I try to find here C:\Users\%USER5\AppData\Roaming\Mozilla\Firefox\Profiles\goiedpyu.default-release\extensions but isn't there any other dictionary except that I installed manually from firefox add-ons.

I would like to disable it because sometimes (especially after updated) firefox swap to default

I would like Firefox to access the Mac OS "Dictionary" for immediate definitions, the way it accesses its own dictionary for spelling, or as Mac's Safari, accesses the Mac dictionary. I see nothing listed in Firefox>Services, nor does the OS's Services Preferences show Firefox as an app to connect services to. I can always get the definition with a right-click on the highlighted word, but I'd like the definition to be a readily available as the spelling.

TIA,