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Greasemonkey - Customize the way a web page displays or behaves, by using small bits of JavaScript.
Tampermonkey - Greasemonkey compatible script manager.
Random User-Agent - Automatically change the user agent after specified period of time to a randomly selected one, thus...
Violentmonkey - Violentmonkey is a userscript manager to support running userscripts in web pages.
Userscripts - An open-source userscript editor for Safari.
Chameleon WebExtension - Chameleon is a Firefox extension to Spoof your browser profile.