Hello! Thank you for bringing this issue to our attention.

We recently upgraded our Firefox extension which should have fixed the bug causing the TinEye option to disappear from the right-click context menu. Please try to install the TinEye extension for Firefox once again and let us know if you experience any issues.

Please also note that if you have Firefox in “permanent private mode”, or set to not remember history or cookies, you will have to manually enable our extension in the add-ons manager to be allowed in private mode.

I hope this solves the problem, though please let me know if the issue persists and I'll be happy to look into this for you. Cheers!