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''<p>arthur.sprogis [[#question-1486741|said]]</p>'' <blockquote>I have downloaded additional dictionaries to spell check when I'm writing in other languages on the firefox browser, yet I am unable to switch to those dictionaries. I've tried multiple. I have cleared caches. I have restarted. I have installed and uninstalled. I have the latest version. </blockquote> The first image shows you were on the French Language Pack page and not the French Dictionary page. They are two different things. On top of https://addons.mozilla.org/firefox/language-tools/ <blockquote>Installing a dictionary add-on will add a new language option to your spell-checker, which checks your spelling as you type in Firefox. Language packs change your browser’s interface language, including menu options and settings.</blockquote> https://support.mozilla.org/en-US/kb/how-do-i-use-firefox-spell-checker#w_add-dictionaries On the above language tools page there are two French dictionaries listed https://addons.mozilla.org/firefox/addon/dictionnaire-fran%C3%A7ais1/ https://addons.mozilla.org/firefox/addon/corecteur-ortografe-simplifiee/