It seems you installed the en-GB language pack and not the en-GB dictionary. This is a misunderstanding we regularly see happen.

For spell checking you need a dictionary.

• Dictionaries appear in "Add-ons -> Dictionaries".

A language pack provides string translations for the user interface.

• Language packs appear in "Add-ons -> Languages".
• https://support.mozilla.org/en-US/kb/use-firefox-another-language

You can see which dictionary is selected if you right-click in a text area and open the Languages sub menu. At least one dictionary should be installed and have a check mark to indicate that it is selected.

• open the "Add Dictionaries" link to install a dictionary if you do not have one.

The spelling checker is enabled if [X] "Check Spelling" in the right-click context menu has a checkmark.

You can look here for dictionaries. Make sure you look at the Dictionaries column.

• https://addons.mozilla.org/firefox/language-tools/

It seems you installed the en-GB language pack and not the en-GB dictionary. This is a misunderstanding we regularly see happen. For spell checking you need a dictionary.

• Dictionaries appear in "Add-ons -> Dictionaries".

A language pack provides string translations for the user interface.

• Language packs appear in "Add-ons -> Languages".
• https://support.mozilla.org/en-US/kb/use-firefox-another-language

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You can see which dictionary is selected if you right-click in a text area and open the Languages sub menu. At least one dictionary should be installed and have a check mark to indicate that it is selected.

• open the "Add Dictionaries" link to install a dictionary if you do not have one.

The spelling checker is enabled if [X] "Check Spelling" in the right-click context menu has a checkmark.

You can look here for dictionaries. Make sure you look at the Dictionaries column.

• https://addons.mozilla.org/firefox/language-tools/

Thanks for the reply. I am unclear how to view or even install a dictonary in FF. Can you provide instructions?

See:

• https://support.mozilla.org/en-US/kb/how-do-i-use-firefox-spell-checker

All working now, thanks cor-el!

I am a senior and I am becoming increasing frustrated with your system. My spell checker stopped working and none of the advice here is helping.

I just need simple instructions that work and ideally by email if possible

I am a senior and I am becoming increasing frustrated with your system. My spell checker stopped working and none of the advice here is helping.

Hi,

I was also finding this really frustrating, given it should just work out of the box in my opinion.

To resolve this, I went to Dictionaries and Language Packs and above the long table, it says "Available for your locale", open both links there and install the language pack and dictionary. Once that's done I think you need to restart Firefox.