should mention they only kneecapped it on chrome-based browsers; Firefox is retaining Manifest V2 even as they add MV3, and their MV3 implementation doesn't have some of the deficiencies Google put in theirs
Vivaldi will keep MV2 as long as they can but I think they intend to basically build uBlock's capabilities in natively so it wouldn't be dependent on an addon
trying to use the install script from this site https://www.privateinternetaccess.com/download/linux-vpn but running into this issue if you run it outside of toolbox, it can't access the directory it tries to write to, and if you use sudo in or out it fails and tells you to install as normal user