I noticed last night that the Web Clipper had stopped working for me. It was late so I didn’t post about it then. It happened again tonight—I get to a page where it normally had worked well, like this 1850 census page from FamilySearch, I click on the extension’s toolbar button, and nothing happens. The pop-up window isn’t hiding behind other windows I have open, I checked. I tried re-installing the extension, and I tried disabling Adblock Plus, no difference.
MacOS High Sierra v. 10.13.4
Chrome Version 66.0.3359.139 (Official Build) (64-bit)
Rootsfinder Web Clipper v. 0.2.0
Let me know what other info you need.