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Re:uBlock Origin Maintainer on Chrome vs. Firefox WebExtensions by TacoScott on Thursday August 10, 2017 @10:29AM (#14980031)
Typically it seems to poll window height/width vars in js. https://github.com/sindresorhus/devtools-detect

Another variant: https://stackoverflow.com/questions/7798748/find-out-whether...

Re:uBlock Origin Maintainer on Chrome vs. Firefox WebExtensions by wfunction on Thursday August 10, 2017 @05:19PM (#14984394)
Sorry I meant I was looking for more like documentation on the product rather than implementation. Thanks though.