Firefox Desktop OSs

Disable Extension Install Delay
 In the address bar type 'about:config' and press Enter. In the filter bar type 'security.dialog_enable_delay' In the windows below double-click on the entry and change the value to 0 for disabling the delay and lower values to decrease the wait time, the setting is in milliseconds.. 

Editing The Dictionary Word List After Adding An Incorrect Spelling
The location of the dictionary can be found in the following locations depending on your operating system:  Linux - /home/gcoles/.mozilla/firefox/xxxxxxxxxx.default/extensions/en-GB@dictionaries.addons.mozilla.org/dictionaries Mac OSX - ~/Library/Application Support/Firefox/Profiles/xxxxxxxx.default/ Windows XP - C:\Documents and Settings\%User%\Application Data\Mozilla\Firefox\Profiles\aqyixwg1.default\extensions\en-GB@dictionaries.addons.mozilla.org\dictionaries Windows Vista - C:\users\%User%\AppData\Roaming\Mozilla\Firefox\Profiles\xxxxxxxx.default\  Open the following file to edit:  Linux - en-GB.dic Mac OSX - Windows XP - en-GB.dic Windows Vista - </ul>

Enable In-Line Spell Check In All Textboxes And Webforms
 <li>In the address bar type 'about:config' Enter <li>In the filter box type 'layout.spell' <li>In the windows below double-click on the entry and change the value to 2 </ol>