firefox_extension_header_image_switch
Description: every time switch Tab, browser change 'Header image'(aka. Appearance), image read from local folder.
Compatibility: Firefox version <= 56 need Developer version or WaterFox, otherwise 'xpinstall.signatures.required' will not effect, this mean can not install any extension without "Mozilla signature".
Usage: 1.need enable a appearance, otherwise default appearance will covered Header image. 2.set image path by click extension icon.
Notice: *extension will loop through all sub directory. *acfun banner.rar is my collected Acfun and Bilibili banner, very suitable for Header image. *path can be relatively with profile folder, Example: .\Header Image mean: C:\Firefox\Profiles\my profile\Header Image
