You may have noticed that from about version 4 and upwards Firefox has turned off support for pinch to zoom. As a Mac user this will no doubt be something you’ll want to turn back on. It’s simple to do. Here is how:

  1. Open a new Tab and type in “about:config” (without the quote) in the address bar
  2. You will be asked to confirm to continue. Just do it.
  3. Search for the term “browser.gesture” or “pinch” (without the quote marks). Either term will do.
  4. Edit each browser.gesture.pinch setting as follows:
  • — Value = cmd_fullZoomReduce
  • — Value = cmd_fullZoomReset
  • browser.gesture.pinch.latched — Value = false
  • browser.gesture.pinch.out — Value = cmd_fullZoomEnlarge
  • browser.gesture.pinch.out.shift — Value = cmd_fullZoomReset
  • browser.gesture.pinch.threshold — Value = 40 to 100 (set it to a number that works for you)

To change the above values you simply double click the Value area on the settings table.

You will be changing the settings from this:







… over to this:

Pinch settings new

Choose the threshold that works for you. I have it set to 50. I’ve seen people saying it works well for them on various settings, from as low as 40 and up to about 80. The default is usually 150, and this may make the zooming feature awkward for most people. A lower number typically works better.