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# µMatrix for Chromium
[Under development: usable, but not stable, many things broken because in the midst of general refactoring]
[Under development: usable]
Forked from [HTTP Switchboard](https://github.com/gorhill/httpswitchboard).
Differences with HTTP Switchboard:
- No pattern-based filtering -- use [µBlock](https://github.com/gorhill/uBlock) for this.
- Rules from broader scopes propagate to narrower scopes ([HTTP Switchboard issue #227](https://github.com/gorhill/httpswitchboard/issues/227)):
- This means rules in global scope are ubiquitous, i.e. no longer sandboxed
- See matrix as really 3D: evaluation order: Z, then X and Y, where
- Z is the source hostname axis (aka "scope"), from narrower scopes to global scope
- X is the request type axis: `*`, `cookie`, `css`, etc.
- Y is the destination hostname axis (`www.example.com`, `example.com`, `com`, `*`)
- Thus, **every** request is evaluated starting from the scope as per request's hostname, down to global scope if no explicit rule is found on the way down.
- Switching scopes in matrix popup does not create/delete scopes, this just allows a user to modify rules in a specific scope
- Rules in narrower scope(s) still exist and are enforced even if you have the global scope selected
- Settings which no longer exist:
- _"Enable strict blocking"_: This is the only available mode. Strict-blocking was added at some point during HTTPSB development, and at the time I kept "loose blocking" just to not upset the users who already got used to this way of working.
- _"Auto create temporary [domain | site]-level scope"_: Not needed anymore with the new literal `1st-party` row. Set rules on the `1st-party` row in the global scope: these rules will be inherited by whatever row is deemed first-party to the URL in the address bar.
- _"Copy all rules from global scope into newly created local scopes"_: Not needed anymore since all scopes virtually exist at all time.
- _"Auto delete unused temporary scopes"_: Again, not needed anymore since all scopes virtually exist at all time.
- Much needed [code refactoring](http://en.wikipedia.org/wiki/Code_refactoring) toward portability/efficiency
- Big chunks of tired code have been removed, or replaced by small chunks of better code
- There is no longer a hierarchical data structures for scopes/rules (**major** contribution toward code simplification)
- Thus no need to manage the creation/deletion of scopes (and related settings)
- All scopes virtually exist at all time.
- The popup matrix simply activate whatever last scope level was in use
[Differences](https://github.com/gorhill/uMatrix/wiki/Changes-from-HTTP-Switchboard) with HTTP Switchboard.
## License