This is primarily intended to be a helpful note to anyone dealing with the problem where recent firefox, possibly only when built against gtk3, loses its scrollbar "thumbs", a problem I was seeing here, with the mozilla-built binary[1], but others may find it worthwhile, and beautiful, as well.
A google suggests the problem is gtk-3.20-related, as one poster found that downgrading to gtk-3.18.x returned his scrollbars. However, I wasn't particularly thrilled at the idea of downgrading so I continued googling. Fortunately there's a rather nice workaround in the form of the "NewScrollbars (aka NoiaScrollbars)" extension. Yes, that's the name, including the aka in parentheses. https://addons.mozilla.org/en-US/firefox/addon/noiascrollbars/ They're customizable color-gradient scrollbars that as one of the reviews says, are "Way better looking than the default." "Just classes up the appearance of the page. Great useful add on." Even *more* "useful" and "great" when they avoid a bug in the default, but now I'm glad I had the bug as I'd have been unlikely ever to find them, otherwise, and they're both rather pretty and customizable enough to work with my "reverse" color scheme with light on dark! =:^) --- [1] Mozilla-built binary: Since IMO gentoo seems to be late with updates, potentially fatally late, for what's likely the most exposed app on the system, so now I get the builds direct from mozilla. I do understand that the gentoo maintainers have to make sure it actually builds on the wide range of what gentoo users have installed and that's not always exactly simple, but even when the update's available even just a week after the upstream release, when that could well be five days vulnerable to an active exploit, it counts! So I'm not exactly happy with the idea, but I'm grabbing the binary direct from mozilla now, and letting firefox itself handle the updates. At least that way I get them the day of release or so, not generally days after release when I may be already exploited if I'm waiting on gentoo. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman