Short Firefox tip to disable
Cmd + MouseWheel zoom. There is a weird interaction with it. Therefore I decided to turn it off completely (I never used it anyway).
When I scroll a page using a trackpad and start switching tabs via
Cmd + Tab, inertia scrolling would still be active, and the page I switched to gets zoomed in a lot (as I'm still holding
Cmd). It really got on my nerves.
To disable it, you'll need to type
about:config in your address bar. A warning page (This page will allow you to change hidden browser settings, so be careful with it.) may appear. Continue like the hacker you are, and search for
mousewheel.with_meta. You should see something like this:
We need to change
0. To change it, click on the edit button (or just double click the value). And that is it!
For people who are not on Mac and want to disable
Control + Mouse Wheel, follow the same procedure and change
If you ever want to switch it back on, find the same option, and change it back to
3. Once you change a value, Firefox will give you a small reset button, just in case you forgot the default value.