I'm giving this previously very useful extension a reluctant 2-star rating on account the extension, which worked great in the past, ceased functioning after Google implemented some recent user interface changes. I'll gladly up my rating if and when functionality is restored. Google still has the capability of searching for specific image size ranges in its advanced search options, which gives me hope that a code patch may be all that's required to restore this extension's functionality.

was super useful, but does not work anymore 😭

No longer work recently since google changes, impossible to open issue in github as there aren't any.

Mozilla Firefox 128.0b8 (64-bit) — OK.

Upd. Mozilla Firefox 139.0b8 (64-bit), Google Image Sizer 2.0.1 — no longer works.