View source for Compatibility/UA Override & Interventions Testing

Mozilla added a new web compatibility page to Firefox as a new about page in Firefox, in order to make compatibility modifications for Internet sites and services transparent.

These modifications are divided into User Agent Overrides and Interventions:

 - '''Interventions''' - are deeper modifications to make sites compatible. Firefox may modify certain code used on these sites to enforce compatibility. Each compatibility modification links to the bug on Bugzilla@Mozilla; click on the link to look up information about the underlying issue.

 - '''User Agent Override''' - change the user agent of Firefox when connections to certain sites are made. 
Some sites may use the user agent of connecting browsers to block access completely, display a different design, or provide different functionality.

Viewing the list of Interventions and Overrides on Desktop and Mobile

Desktop screenshot:

[[File:Desktop AboutCompat.jpg|Desktop AboutCompat.jpg]]

Mobile screenshot:
[[File:MobileAbout Compat.jpg|MobileAbout Compat.jpg]]

Verifying if the website has been fixed on their end
 - Load the page by pointing Firefox to about:compat. 
 - Just type about:compat in the Firefox address bar to display all web compatibility modifications that are active at the time.
 - Disable modifications with a click on the disable button next to them. 
 - The button toggles between disable and enable, so that you may enable the compatibility modification again at a later point in time.

What you need:
 - Windows machine
 - MacOS machine
 - Linux machine
 - Mobile device running Android

[[Category: Web Compatibility]]