How can I get the middle mouse button to behave correctly in Ubuntu? Clicking the middle button does not show the arrow which allows me to scroll the page by moving the mouse.
Edit 2022-01-28: this answer is verified with Firefox 96.0b3
Edit 2020-11-23: this answer is verified with Firefox 62.0.3
Edit 2018-03-14: this answer is verified with Firefox 58.02
Just to precise, since version 57 of Firefox the path is the following: Menu ➜ Preferences ➜ General, then all the way down in the Browsing section check the box Use auto scrolling.
You can also just type auto in the search field once you're in the Preferences window.
Edit ➜ Preferences ➜ Advanced ➜ Check 'Use autoscrolling'
Edit 2022-01-28: this answer is verified with Firefox 96.0b3
Edit 2020-11-23: this answer is verified with Firefox 62.0.3
Edit 2018-03-14: this answer is verified with Firefox 58.02
Just to precise, since version 57 of Firefox the path is the following: Menu ➜ Preferences ➜ General, then all the way down in the Browsing section check the box Use auto scrolling.
You can also just type auto in the search field once you're in the Preferences window.
See this screenshot: