Hey,
I’m not sure what’s going on but I have a major bug after installing this add-on. If I bookmark one line, then bookmark another above it, the one below it is frozen and can’t be toggled. This isn’t the exact behavior as sometimes the bookmark can be below but all I know is whenever I add two bookmarks, one after another without toggling, one of them freezes up. I get bookmarks stuck everywhere and I’ve had to uninstall this add-on.
By the way the only functionality I had on was the save bookmarks. I really like the idea of that feature but the add-on needs to be fixed.