I installed it, but I don't see any "browser button" I'm assuming the purpose isn't to merely create a bookmark for Google Scholar... support page does not exist or I would search for help. Using latest Firefox. I use Google Scholar almost every day.

We have to work on the central nervous system.
https://en.m.wikipedia.org/wiki/Special:Contributions/2A02:A018:C1:8C00:954A:B2DB:9C1B:C1E7

Works great, convenient for students

This review could be 5 stars if I could locate the button on Mac Firefox/Mozilla. Locating the button is not straight forward however eventually I could do it on the personal PC. Then I spent >1 hr to search on Mac Firefox and on internet to find the button on the MAC , but eventually I gave up. Without a visible button to click the extension/add-on is unusable. Where I could use it (PC) it appeared to be fabulous. Very upsetting

Not open source. I don't trust it.