Unsupport $rewrite filter option with URL
$rewrite filter option (without
abp-resource:) is widely unused (one single filter in RuAdlist, none in EasyList, EasyList Germany, EasyList China, Liste FR or in the ABP filters list).
Furthermore, it might be impossible to keep supporting this feature with manifest v3.
Also there have been some concerns about security implications, see adblockpluschrome#1 (closed).
What to change
Hints for testers
Try the examples in https://issues.adblockplus.org/ticket/6622. They should not work anymore.
Try the examples in https://issues.adblockplus.org/ticket/7067. They should continue to work.