Match patterns are a way to specify groups of URLs: a match pattern matches a specific set of URLs. They are for extensions using WebExtensions APIs in a few places, most notably to specify which documents to load content scripts into, and to specify which URLs to add webRequest listeners to.

APIs that use match patterns usually accept a list of match patterns, and will perform the appropriate action if the URL matches any of the patterns. See, for example, the content_scripts key in manifest.json.

Match pattern structure

Note: Some browsers don’t support certain schemes.
Check the Browser compatibility table for details.

All match patterns are specified as strings. Apart from the special "<all_urls>" pattern, match patterns consist of three parts: scheme, host, and path. The scheme and host are separated by "://".

<scheme>://<host><path>

scheme

The scheme component may take one of two forms:

Form Matches
"*" Only "http" and "https" and in some browsers also "ws" and "wss".
One of "http", "https", "ws", "wss", "ftp", "ftps", "data" or "file". Only the given scheme.

host

The host component may take one of three forms:

Form Matches
"*" Any host.
"*." followed by part of the hostname. The given host and any of its subdomains.
A complete hostname, without wildcards. Only the given host.

host must not include a port number.

host is optional only if the scheme is "file".

Note that the wildcard may only appear at the start.

path

The path component must begin with a "/".

After that, it may subsequently contain any combination of the "*" wildcard and any of the characters that are allowed in URL paths. Unlike host, the path component may contain the "*" wildcard in the middle or at the end, and the "*" wildcard may appear more than once.

<all_urls>

The special value "<all_urls>" matches all URLs under any of the supported schemes: that is "http", "https", "ws", "wss", "ftp", "data", and "file".

Examples

Pattern Example matches Example non-matches

<all_urls>

Match all URLs.

http://example.org/

https://a.org/some/path/

ws://sockets.somewhere.org/

wss://ws.example.com/stuff/

ftp://files.somewhere.org/

ftps://files.somewhere.org/

resource://a/b/c/
(unsupported scheme)

*://*/*

Match all HTTP, HTTPS and WebSocket URLs.

http://example.org/

https://a.org/some/path/

ws://sockets.somewhere.org/

wss://ws.example.com/stuff/

ftp://ftp.example.org/
(unmatched scheme)

ftps://ftp.example.org/
(unmatched scheme)

file:///a/
(unmatched scheme)

*://*.mozilla.org/*

Match all HTTP, HTTPS and WebSocket URLs that are hosted at "mozilla.org" or one of its subdomains.

http://mozilla.org/

https://mozilla.org/

http://a.mozilla.org/

http://a.b.mozilla.org/

https://b.mozilla.org/path/

ws://ws.mozilla.org/

wss://secure.mozilla.org/something

ftp://mozilla.org/
(unmatched scheme)

http://mozilla.com/
(unmatched host)

http://firefox.org/
(unmatched host)

*://mozilla.org/

Match all HTTP, HTTPS and WebSocket URLs that are hosted at exactly "mozilla.org/".

http://mozilla.org/

https://mozilla.org/

ws://mozilla.org/

wss://mozilla.org/

ftp://mozilla.org/
(unmatched scheme)

http://a.mozilla.org/
(unmatched host)

http://mozilla.org/a
(unmatched path)

ftp://mozilla.org/

Match only "ftp://mozilla.org/".

ftp://mozilla.org

http://mozilla.org/
(unmatched scheme)

ftp://sub.mozilla.org/
(unmatched host)

ftp://mozilla.org/path
(unmatched path)

https://*/path

Match HTTPS URLs on any host, whose path is "path".

https://mozilla.org/path

https://a.mozilla.org/path

https://something.com/path

http://mozilla.org/path
(unmatched scheme)

https://mozilla.org/path/
(unmatched path)

https://mozilla.org/a
(unmatched path)

https://mozilla.org/
(unmatched path)

https://*/path/

Match HTTPS URLs on any host, whose path is "path/".

https://mozilla.org/path/

https://a.mozilla.org/path/

https://something.com/path/

http://mozilla.org/path/
(unmatched scheme)

https://mozilla.org/path
(unmatched path)

https://mozilla.org/a
(unmatched path)

https://mozilla.org/
(unmatched path)

https://mozilla.org/*

Match HTTPS URLs only at "mozilla.org", with any path.

https://mozilla.org/

https://mozilla.org/path

https://mozilla.org/another

https://mozilla.org/path/to/doc

http://mozilla.org/path
(unmatched scheme)

https://mozilla.com/path
(unmatched host)

https://mozilla.org/a/b/c/

Match only this URL.

https://mozilla.org/a/b/c/ Anything else.

https://mozilla.org/*/b/*/

Match HTTPS URLs hosted on "mozilla.org", whose path contains a component "b" somewhere in the middle.

https://mozilla.org/a/b/c/

https://mozilla.org/d/b/f/

https://mozilla.org/a/b/c/d/

https://mozilla.org/b/*/
(unmatched path)

https://mozilla.org/a/b/
(unmatched path)

file:///blah/*

Match any FILE URL whose path begins with "blah".

file:///blah/

file:///blah/bleh

file:///bleh/
(unmatched path)

Invalid match patterns

Invalid pattern Reason
resource://path/ Unsupported scheme.
https://mozilla.org No path.
https://mozilla.*.org/ "*" in host must be at the start.
https://*zilla.org/ "*" in host must be the only character or be followed by ".".
http*://mozilla.org/ "*" in scheme must be the only character.
https://mozilla.org:80/ Host must not include a port number.
*://* Empty path: this should be "*://*/*".
file://* Empty path: this should be "file:///*".

Browser compatibility

scheme

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxOperaFirefox for Android
Wildcard * schemeChrome Full support YesEdge Full support 14Firefox Full support 48Opera Full support YesFirefox Android Full support 48
* matches ws and wssChrome No support NoEdge ? Firefox Full support 55Opera No support NoFirefox Android Full support 55
httpChrome Full support YesEdge Full support 14Firefox Full support 48Opera Full support YesFirefox Android Full support 48
httpsChrome Full support YesEdge Full support 14Firefox Full support 48Opera Full support YesFirefox Android Full support 48
wsChrome No support NoEdge ? Firefox Full support 55Opera No support NoFirefox Android Full support 55
wssChrome No support NoEdge ? Firefox Full support 55Opera No support NoFirefox Android Full support 55
ftpChrome Full support YesEdge Full support 14Firefox Full support 48Opera Full support YesFirefox Android Full support 48
ftpsChrome No support NoEdge No support NoFirefox No support No
Notes
No support No
Notes
Notes See bug 1463440
Opera No support NoFirefox Android No support No
Notes
No support No
Notes
Notes See bug 1463440
fileChrome Full support YesEdge Full support 14Firefox Full support 48Opera Full support YesFirefox Android Full support 48
dataChrome No support NoEdge ? Firefox Partial support 48
Notes
Partial support 48
Notes
Notes Doesn’t support injection of content scripts or stylesheets.
Opera No support NoFirefox Android Partial support 48
Notes
Partial support 48
Notes
Notes Doesn’t support injection of content scripts or stylesheets.

Legend

Full support  
Full support
Partial support  
Partial support
No support  
No support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.

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Last updated by: irenesmith,