Do you have any experience with testing software? It is always possible that things aren't working like they should and in such a case you need to know how to handle such issues. You should always keep the latest Firefox release version installed and install other development versions alongside to it via a custom install, so you can fall back to the release in case of problems. *https://www.mozilla.org/en-US/firefox/23.0beta/releasenotes/ Currently the Beta versions are updated twice per week for weeks 2-5 and once a week in week 1 and 6 in the 6 week cycle. *https://wiki.mozilla.org/Firefox/Planning/2013-07-17 If you want to give it a try: Do a custom install and install the Beta version in its own program folder to use multiple Firefox versions. * https://support.mozilla.com/kb/Custom+installation+of+Firefox+on+Windows Make sure not to start Firefox after the installation has finished. Create a new profile exclusively for the Firefox Beta version. Create a desktop shortcut with -P "profile" appended to the target to launch each Firefox version with its own profile. See these mozillaZine KB articles for information: * http://kb.mozillazine.org/Testing_pre-release_versions * http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows * http://kb.mozillazine.org/Shortcut_to_a_specific_profile * http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox * http://kb.mozillazine.org/Bypassing_the_Profile_Manager ------ *http://www.mozilla.org/en-US/firefox/beta/ *http://www.mozilla.org/en-US/firefox/all-beta.html