Search By Image (by Google) has been blocked for your protection.

Why was it blocked?
The Search By Image (by Google) extension causes very high CPU utilization during regular browsing, often damaging user experience significantly, in a way that is very difficult to associate with the extension. Users who want to continue using the add-on regardless of its performance impact can enable it in the Add-ons Manager.
Who is affected?
All Firefox users who have this add-on installed.
What does this mean?

The problematic add-on or plugin will be automatically disabled and no longer usable.

When Mozilla becomes aware of add-ons, plugins, or other third-party software that seriously compromises Firefox security, stability, or performance and meets certain criteria, the software may be blocked from general use. For more information, please read this support article.