“This warning isn’t just for uBlock Origin users. All extensions built on MV2 will display this warning on the Chrome extensions page if users have updated to Chrome version 127. Users of Chrome’s Beta, Dev, and Canary channels have been seeing these warnings since June 3, 2024.
Although users can temporarily re-enable their MV2 extensions, Google plans to disable these extensions gradually over the next few months. Eventually, users won’t be able to use MV2 extensions at all and will have to switch to MV3 alternatives suggested by the Chrome Web Store.”