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In August of 2015, Mozilla announced that the legacy XPCOM- and XUL-based extension systems would be deprecated in favor of the WebExtension API. Between that date and November, 2017, both legacy and WebExtension add-ons were supported in some fashion. With the release of Firefox 57 (Quantum) in November, 2017, WebExtensions became the only supported API for extension development.
Foxy Gestures
Use the gestures to control the browser, like close tabs, refresh
Proxy SwitchyOmega
Set up the proxys and rules to surfe
S3.Translator
Translate the whole page by Google Translate
Tampermonkey
Use the userscript to modify some elements.
uBlock Origin
Block the ads.
BaiduExporter
Export the BaiDuYun download link to aria2.
HTTP Header Live
Capture the HTTP request.
User Agent Switcher
Change the User Agent of the browser.
Awesome Screenshot Plus
Capture the whole page or any portion