for example im using Nightly and i want my addons working.
download and install the Nightly Tester Tool
go to options > Nightly Tester Tool > Force Addon Compatibility
- Type about:config in Firefox address bar and press Enter.
- It'll ask for confirmation, click on "I'll be careful, I promise!" button.
- right-click anywhere and select "New", then "Boolean".
- Give it name: extensions.checkCompatibility.9.0 (or 10.0, 11.0, etc...depending the version using)
- set the value to false.