Have you installed a dictionary? On the Add-ons page ( https://addons.mozilla.org/en-US/firefox/ ). click "More..." at the top of the page and choose "Dictionaries and Language Packs". *https://addons.mozilla.org/en-US/firefox/language-tools/ Also see: *http://support.mozilla.com/en-US/kb/Using+the+spell+checker *http://kb.mozillazine.org/Spell_checking '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.''' ------------------------- Not related to your question, but... You may need to update some plug-ins. Check your plug-ins and update as necessary: *Plug-in check --> http://www.mozilla.org/en-US/plugincheck/ *Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.org/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox] *Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.org/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox] *'''''Shockwave Flash (Adobe Flash or Flash)''''': [https://support.mozilla.org/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox] *'''''Next Generation Java Plug-in for Mozilla browsers''''': [https://support.mozilla.org/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

Do you have a dictionary installed and selected? You can see which dictionary is selected if you right-click in a text area and open the Languages submenu. *Open the "Add Dictionaries" link to install a dictionary if you do not have one. *Make sure that [X] "Check Spelling" in the right-click context menu is check-marked. You can enable or disable spell checking globally: *Tools > Options > Advanced : General: Browsing: "Check my spelling as I type" ---- *https://support.mozilla.org/kb/Using+the+spell+checker *http://kb.mozillazine.org/Dictionaries *http://kb.mozillazine.org/Spell_checking

The en-US version of Firefox on Aurora channel should come with a en-US dictionary.

Worked just days ago. I haven't done anything.

Did you verify that there is a dictionary selected? Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes). *Don't make any changes on the Safe mode start window. *https://support.mozilla.org/kb/Safe+Mode *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes