Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox. Is the problem still there?

Fred this is a Linux specific question as I know you are a Windows user and never used Linux.

MarkZH said

Up until the last update, this was the behavior of the scrollbar when clicking on it: Left-click above/below indicator: equivalent to PageUp/PageDown Middle-click above/below indicator: scroll directly to that position Now, the behavior is as follows: Left-click above/below indicator: scroll directly to that position (old middle-click behavior) Middle-click above/below indicator: Nothing Is there a setting that controls this or some way to get the old behavior back?

The first way works for me in Firefox 42.0 and 43.0 from www.mozilla.org/firefox/all

Type about:config in Location (address) bar and filter for middlemouse.scrollbarPosition and toggle it to true if it is set at false.

http://kb.mozillazine.org/middlemouse.scrollbarPosition

James said

The first way works for me in Firefox 42.0 and 43.0 from www.mozilla.org/firefox/all Type about:config in Location (address) bar and filter for middlemouse.scrollbarPosition and toggle it to true if it is set at false. http://kb.mozillazine.org/middlemouse.scrollbarPosition

This sounds like the right setting, but toggling it doesn't have any effect. Neither "true" nor "false" activate the middle mouse button on the scrollbar.

MarkZH said

This sounds like the right setting, but toggling it doesn't have any effect. Neither "true" nor "false" activate the middle mouse button on the scrollbar.

Did you restart Firefox to make sure setting had effect?

What Extensions do you have installed?

James said

MarkZH said

This sounds like the right setting, but toggling it doesn't have any effect. Neither "true" nor "false" activate the middle mouse button on the scrollbar.

Did you restart Firefox to make sure setting had effect?

What Extensions do you have installed?

I restarted for both values. No effect.

Addons: Back to Owner Tab AdBlock Plus Search by Image for Google Send Tab to Device

Are you using the Firefox version from the official Mozilla servers or the version from the repositories of your Linux distribution?

Try the version from the official Mozilla server if you currently use a version from the repositories of your Linux distribution. You can find the full version of the current Firefox release (43.0.1) in all languages and all operating systems here:

• https://www.mozilla.org/en-US/firefox/all/

I'm using Firefox 34 from the Manjaro repositories (a variant of Arch).

I've solved the problem using the solution from here: http://askubuntu.com/a/296406/283296

Namely, create a file called

~/.config/gtk-3.0/settings.ini

and place the following inside

[Settings] gtk-primary-button-warps-slider = false

Thanks for the help.

For my own reference, there are two bug reports that describe this issue, though both were marked RESOLVED: https://bugzilla.mozilla.org/show_bug.cgi?id=803633 https://github.com/gnome-integration-team/firefox-gnome/issues/164#issuecomment-13376849

Firefox 34.0 is a old Release that came out December 1st, 2014. The current Release is Firefox 43.0.1

James said

Firefox 34.0 is a old Release that came out December 1st, 2014. The current Release is Firefox 43.0.1

Typo. I have 43.0.