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Set UA to 9 initial.rev5.1-signed.1-signed
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 marked as experimental by its developers
This add-on is not compatible with your version of Firefox because of the following: