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[BUG] Exclusionary rules to the Injection blacklist settings are ignored

3

### Sequence of actions: 1. Set the following Injection blacklists under the Blacklist settings: ``` file://*/* @exclude-match file://*/*.webm ``` 2. Install the following userscript: ``` https://github.com/WhatIsThisImNotGoodWithComputers/webm-looper-userscript/raw/master/webm-looper.user.js ``` 3. Open a...