Better Pixiv viewing | Fullscreen images | Faster searching | Bigger thumbnails | Download ugoira MKV | Ugoira seek bar | Download manga ZIP | One-click like, bookmark, follow | One-click zoom and pan
< Feedback on ppixiv for Pixiv
I'm guessing you're in Firefox, since its private mode is a bit poorly implemented (it disables APIs entirely instead of actually making them private, which breaks things). Try updating to r171, it should work around it.
Tag translations don't work in private browsing?