Remove unused variable
Make Opera a possible browser to test with
Merge pull request #4563 from bthorben/testWithOpera

Test with opera
Read color info from JPX stream

Fix colors problem #4540 + minor cleanup

fix lint warnings
Use Stream instead of byte array access
Using shell/cmd commands to kill browser tasks
Protects from killing a closed process
Merge pull request #4565 from fkaelberer/fixJPXparsing

Read color info from JPX stream + fix color problem #4540