Set UA to 9 initial.rev5.1-signed No Restart
This addon overrides your useragent string to be one that uses a single-digit version number (version 9.0.1) to help test bad sites. Disabling or removing the addon resets the UA string to normal.
This add-on has been preliminarily reviewed by Mozilla. Learn more
This add-on is not compatible with your version of Firefox because of the following: