Use it since years! Its GREAT if you want to set the User Agent globaly, which is required if you are using Multi Acc. Containers/Temporary Containers, because a fresh Container has the true User Agent no matter which User Agent Managing Addon I tried. This Addon also is one of the fews that has ALL APIs except the Font Fake Readout, slimming your JS Fingerprinting Addons down. Another major for me is that you can devicde if you want a fixed readout fake or like the DOM In and out be faked, because many addons do not let the user decide. Overall I hope it will be a long supported app, and would consider to donate without hesitation (Dev, please add some "civilian" payment method, because I will not send you BTCs :D sorry). And thank you again Dev, your work really is appreciated and I wished I could have helped you with the translation, but we speak the same native language so you have already done it ;o)