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Firefox spellchecker not working in Office 365 Web

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Since Firefox updated recently, the Firefox spell checker (right click) no longer works in Outlook 365 Web. It works in every other window (google, gmail, etc.). In other windows, I have all the correct options on the right-click menu:

Undo Cut Copy Paste Delete Select All Check Spelling Languages> Inspect Accessibility Properties Inspect Element

In Outlook, the Firefox right click menu has only the following options :

Undo Cut Copy Paste Delete Select All Inspect Accessibility Properties Inspect Element

The languages and spell check options are not there.

I am a dual language user, and have dictionaries and language packs enabled for both languages in Firefox. "Spell check when I type" is checked, and I regularly use the "Languages" option to switch between languages in all windows.

With the loss of this option in the right-click menu in Outlook, I can no longer check messages in both languages. It seems as if Outlook has disabled the Firefox spell checker. I can spell check using the Outlook spell checker (left click menu) but only in one language.

I saw one solution (https://support.mozilla.org/en-US/questions/987216) which suggested I click on "Inspect Element" and see if spellcheck=false. It opened a window with many options (see screenshot), and I have no idea even where to look for "spellcheck=false" to delete it.

The menu used to work properly in previous iterations of Outlook 365 and Firefox; I don't know what has changed, but I would be grateful for any help you can offer in helping me get the "languages" and "spellcheck" options back in my right click menu in Outlook 365.

Thank you!

Attached screenshots