added system.md
Fixed old regression, that stop the iteration of include rules for content style after a "*" rule
Updated unit test
Merge branch 'master' into 784865
...
Bug 725409 - Modules should have metadata to specifying applications' compatibility

- Added `engines` property to metadata
- Replaced manual exceptions for unsupported application in modules
- Modified cuddlefish and loader to enable parsing module's metada during module loading
- Added methods to `xul-app` to verify the applications' compatibility
- Update unit testing
fix bug
added tests
Bug 777823 - private-browsing module's isActive property should return true only if any window is in PB mode
Merge branch 'master' into 821774
Merge branch 'master' into 784865
Merge branch 'master' into 784865
Merge remote branch 'main/master' into 784865
updates to system.md
finish draftin system.md; update cfx-tool
fixing up system.md
Merge remote-tracking branch 'origin/784865' into 784865
updated code samples in guides and tutorials
Merge branch 'master' of https://github.com/mozilla/addon-sdk into 777823v2
bug 777830 and 822863 updating pb events and adding windows.open private option