My firefox spell checker is not working even though I made sure that option was on in my settings.
My spell checker on Firefox is not working. I went to tools to check on that option, and it was already enabled. It chooses when it wants to work. Whenever the red squiggly line appears, I go and fix the word. After I fix it, if I have another word that is misspelled, the red squiggly line doesn't appear again.
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. You can use "Disable all add-ons" on the Diagnose Firefox issues using Troubleshoot Mode start window to disable all extensions. You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")