Meta Viewport Adder was created to solve a problem I had when using my favorite browser Firefox, my goal is not to dedicate myself to add features in the short or long term.
This extension edits the meta viewport tag to include no-user-scalable and sets it's value to 0. This effectively prevents firefox's double-tap to zoom feature.
If you want to add any feature, improve the code, etc; you can feel free to do so.
Find it in:
If there is a native way to do it in Firefox (such as about:config), please notify me and I will remove it.
All credit goes to "imheinrichlunge" for the original extension. I have modified it to remove the double tap functionality too, as well as adding the meta viewport tag. Original Extension