Must have extension.
But is currently not working.
Upd: is working again.

Extremely useful addon, but a recent update to google image search broke it. Would love to see it fixed.

Unfortunately it doesn't seem to work with the new Google page composition of expanded results to the right side of page.
There are no "Search by image" or "View Image" buttons and context menu "search by image" just opens Google Image search but does not search the image.

View image in Google works! THANKS. Unfortunately Search by image in the context menu does not seem to work anymore on new Firefox versions.

I love this addon but the "view image" button is still not available in FF 101.0.1 (64-bit)

fonctionne à nouveau depuis début juin (v3.6.4)

Não funciona mais. Doesn't work anymore.

It doesnt work since May 28 2022

No longer works as of today, May 30, 2022.

As of 26/05/2022 this extensions is not working, here is a temporary workaround for those who might want it: https://github.com/bijij/ViewImage/issues/242#issuecomment-1139210812