Firefox's spell checker can be a powerful tool for users who write regularly on the Internet but especially for users who write professionally or want to make sure that they do not overlook typing errors.
It helps to have the spell checker running in the background to check for obvious spelling mistakes so that they can be avoided.
It can happen that Firefox's spell check is not working correctly.
The first thing that Firefox users need to do in this case is to see if spell checking is enabled in the web browser. This is done by going to Tools > Options > Advanced. It is required to tap on the Alt-key first in newer versions of the Firefox browser to display the menu bar first before you can go to the Advanced settings in the options.
The Check My Spelling As I Type box needs to be checked for spell checking to work in the browser. If it is not, check it and it is likely that this was the reason why Firefox was not displaying any corrections to you while you were using the browser.
It can happen that the spell check is still not working even if the option is enabled in the settings. This is then usually caused by a missing dictionary file.
To test if this is this case do the following:
Firefox will launch a new window that is displaying available dictionaries for the web browser. All of these dictionaries are installed as add-ons in the web browser. Once the dictionary has been installed spell checking should be working.
Alternatively, do the following to install dictionaries directly in the browser. Visit Firefox's Dictionaries and Language Pack page and click on install dictionary next to the language that you want to enable spell checking for.
If you have installed multiple dictionaries, it is necessary to switch between them in the following way:
If you want to automate the process, use the Dictionary Switcher add-on to do so as it adds the functionality to Firefox.
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