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Check spelling is enabled but won't work on FB and Instagram desktop sites

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On firefox 126.0 (64-bit) the option for spelling check is enabled, but will not appear on the context menu box when right clicked. This happens for the desktop sites of Facebook and Instagram.

On firefox 126.0 (64-bit) the option for spelling check is enabled, but will not appear on the context menu box when right clicked. This happens for the desktop sites of Facebook and Instagram.
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Config Values are as follows:

extensions.spellcheck.inline.max-misspellings 500 layout.spellcheckDefault 1 services.sync.prefs.sync.layout.spellcheckDefault true services.sync.prefs.sync.spellchecker.dictionary true