I have this problem scrolling in FireFox & ThinderBird: when I click on the scroll-arrow with the left mouse-button, the page scrolls incrementally. If I click on the scrollbar instead, the page jumps to the location of the cursor. Ironically, if I click on the scrollbar with the right button, the page moves incrementally, but if I us the rightl button to click on the arrow then the page jumps to the top or bottom (depending on which arrow I clicked on).
Note that this is a big problem if I let the cursor slip onto or off of the arrow position. Then the page can jump to the current cursor location and I lose the place where I was looking at the page.
I don't want it to work that way. I'd like the left button the scroll incrementally whether I click on the arrow or the bar (perhaps scrolling to different degrees) and the right (or middle) button to jump the page to the location of the cursor whether I click on the arrow or the bar.
That way I wouldn't lose the place I was looking at. Left==incremental and Right==absolute, regardless of whether I click on the arrow or the bar.
I have my mouse set to left-handed. I'm using Ubuntu 22.04.
Is there a setting inside the FireFox/ThunderBird about.config that I can use to control this?
