You will have to find the code and make it. Or maybe not.

https://www.howtogeek.com/334716/how-to-customize-firefoxs-user-interface-with-userchrome.css/ https://www.userchrome.org/ https://www.userchrome.org/what-is-userchrome-css.html https://github.com/Aris-t2/CustomCSSforFx/issues/2 https://github.com/axydavid/FirefoxUI/blob/master/README.md https://github.com/wilfredwee/photon-australis There is also a Reddit sub for Firefox Chrome

Please let us know if this solved your issue or if need further assistance.

FirefoxinUbuntu said

I grab the dark trough and mistake it for the light slider. I head wildly toward the bottom of the page or toward the top -- it does exactly opposite of what I want, naturally.

I think you are referring to the vertical scroll bar, which has a "thumb" on it that you can drag upwards or downwards.

Firefox tries to style the scroll bars to match your system theme. Is that your experience on Mint?

Scroll bars are one part of Firefox that are especially difficult to override. There are hacky workarounds involving something called userChromeJS (or userChrome.js). I haven't tried them myself, but you can find some info here: https://www.userchrome.org/what-is-userchrome-js.html

P.S. If you have a scroll wheel on your mouse or other pointing device, you may find that simpler than dealing with a scroll bar in many cases.

You can also try to use a different GTK 3 window theme in your Linux distribution to see if you can find one that looks better (Firefox uses native scroll bars).

jscher2000 said in part I think you are referring to the vertical scroll bar, which has a "thumb" on it that you can drag upwards or downwards. Correct.

Firefox tries to style the scroll bars to match your system theme. Is that your experience on Mint? </blockquote>

I think this is what confuses me: I looked at my system default color scheme in Linux Mint. I have selected the custom "Redmond" theme, which makes Mint look like MS Windows XP or 7 with all the eye candy removed for greatest efficiency. I have the dark-to-light-blue left-to-right on my window title bars. I have a light trough and dark slider and buttons on my scrollbars. EDIT TO ADD: MATE Desktop. /EDIT

Firefox scrollbar is all backwards in that it has a dark trough that I often take for the slider, and a light slider that turns blue on mouse-over, and light buttons on the ends.

I tried a CSS from this forum to "make my scrollbars BIGGER" but it didn't work in my userChrome.css file, which was otherwise empty, in Profile folder "chrome." (Firefox 57.0.1 64-bit) Never heard of the JavaScript userChrome file.

I didn't realize it, but Firefox has evidently been backward in its interpretation of my system colors since day one for the scrollbars, and that has led to my confusion, of course. I recolored them with an extension before it was outdated with a browser update.

jscher2000 said

I think you are referring to the vertical scroll bar, which has a "thumb" on it that you can drag upwards or downwards. Correct

Firefox tries to style the scroll bars to match your system theme. Is that your experience on Mint? Firefox scrollbars color just the opposite of everything else with scrollbars on my MATE Desktop.

Scroll bars are one part of Firefox that are especially difficult to override. There are hacky workarounds involving something called userChromeJS (or userChrome.js). I haven't tried them myself, but you can find some info here: https://www.userchrome.org/what-is-userchrome-js.html

I have been out of circulation for a tear-down-and-paint-the-room, and have not had the chance to follow the advice offered me. When I get Christmas behind me, I will investigate this questio's leads.

I have to come back later to report my findings..... Firefox is one of my most-used apps and its reversed use of colors is an issue I will want to resolve!

Thank you all.

Copy/Paste (will know why when go back in this URL) Scroll also Scroll Bar

• https://addons.mozilla.org/en-US/firefox/extensions/

You may find something or not.

Merry Christmas and Enjoy.