there is a comment on github which rumors because of missing manifest v3 https://github.com/ETCExtensions/Edit-This-Cookie/issues/370 https://github.com/ETCExtensions/Edit-This-Cookie/issues/371 but there exist a fork with MV3 https://github.com/ETCExtensions/Edit-This-Cookie/issues/378 https://github.com/ETCExtensions/Edit-This-Cookie/issues/379 https://chromewebstore.google.com/detail/editthiscookie-updated-fo/ihfmcbadakjehneaijebhpogkegajgnk could be possible, if the original returns, this fork will disappear. for me i use for long time now ACM, which is still MV2, pity https://chromewebstore.google.com/search/Awesome Cookie Manager