I found this app on a data science twitter post for essential add-ins, and it's every bit as legit as I was led to believe

the UI is super cool, love it.

This is truly performance/efficiency saver, thanks!

best firefox application, would be nice if it can get more support from other website and also from firefox.
For solving compatibility issues. (for example the plugin dosen't work in this page)

Cool add-on with great efficiency improvement!

This addon is excellent and essential for my switch from Chrome to Firefox. I wish the find mode worked with regular expressions like the Chromium version, though.

Provides amazing user experience