This is a firefox addon that allows the user to enable CORS everywhere by altering http responses.
This addon is now a WebExtension.
The addon's functionality can be toggled with the included button and is disabled by default.
The button can be found by right-clicking a toolbar and choosing
It is labelled
CorsE and has 3 states:
- red, addon is disabled, CORS rules are upheld.
- green, addon is enabled, CORS rules are bypassed.
- green/red, addon is enabled and using the activation whitelist, CORS rules are bypassed when the origin url matches a filter in the whitelist.
A basic CORS test is available in the repository at
Intended for developers. Use at your own risk.
Available in about:addons.
Enabled at startupEnables this addon on startup.
Force value of "access-control-allow-origin"Self explanatory.
Activation whitelistWhen the addon is enabled, this will check the origin url against the whitelist to decide if headers will be modified. Uses regular expressions.
The addon is enabled but the requests return content as if no user was logged in the target domain.
Try using withCredentials.