Use MODE_CREATE to automatically create file
Add support for Gecko 2 - 6
(missing FileUtils.openFileOutputStream() API)
Don't use FileUtils at all, if used OS.File API
Remove lazy getters for FileUtils and NetUtil:
now we don't use them on modern versions
Use chrome://consolelogger/… instead of detected file:///…
Use recently added "platformVersion" global variable
Correctly disable .message patterns
Note: "extName.message" works only if exists "extName" preference
Update changelog: correctly disable *.message patterns
Update changelog: support for Gecko 2 - 6