Have you installed a dictionary? Not all locales come with a dictionary installed due to licensing reasons. If you do not have the en-US locale then check that you have a dictionary installed (Tools > Add-ons > Extensions) and selected. See the following: * http://support.mozilla.com/en-US/kb/Using+the+spell+checker * http://kb.mozillazine.org/Spell_checking * http://kb.mozillazine.org/Dictionaries * Dictionaries: https://addons.mozilla.org/en-US/firefox/language-tools/ ------------------------ <br /> The information submitted with your question indicates that you have out of date plugins with known security issues that should be updated. To see the plugins submitted with your question, click "More system details..." to the right of your original question post. *Shockwave Flash 10.1 r85 (new security update released 2010-11-04) #'''Check your plugin versions''': http://www.mozilla.com/en-US/plugincheck/ #*'''Note: plugin check page does not have information on all plugin versions''' #'''Update Shockwave Flash''' #*Use Firefox to Download and SAVE to your hard drive from one of the links below; '''<u>the links take you directly to the download and you avoid the "getplus" download manager and "extras" (i.e., toolbars, virus scan links, etc.) on the main Adobe page.</u>''' #*SAVE to your Desktop so you can find it #*After download completes, close Firefox #*Click on the file you just downloaded and install #**Note: Vista and Win7 users may need to right-click the installer downloaded and choose "Run as Administrator" #**Note: Most browsers other than IE will also get updated with this one download #**Note: To update IE, same procedure '''<u>but use IE</u>''' to go: http://fpdownload.macromedia.com/get/flashplayer/current/install_flash_player_ax.exe #*After installation, restart Firefox and check your version again. #*'''<u>Download links and other information</u>''': #** https://support.mozilla.com/en-US/kb/Managing+the+Flash+plugin#Updating_Flash #** '''<u>or</u>''' you can download, save, then run the manual installers for IE, then for Firefox (and all other browsers) from here: http://kb2.adobe.com/cps/191/tn_19166.html#main_ManualInstaller #* Also see: http://support.mozilla.com/en-US/kb/Installing+the+Flash+plugin #* Also see (if needed): http://kb2.adobe.com/cps/191/tn_19166.html#main_Uninstall

Not all locales come with a dictionary installed due to licensing reasons. If you do not have the en-US locale then check that you have a dictionary installed (Tools > Add-ons > Extensions) and selected. You can see which dictionary is selected if you right-click in a text area and open the Languages submenu.<br /> You can open the "Add Dictionaries" link to install a dictionary if you do not have one.<br /> Also make sure that [X]"Check Spelling" in the right-click context menu has a tick. See also: * http://kb.mozillazine.org/Spell_checking * http://kb.mozillazine.org/Dictionaries * [[Using the spell checker]]