uMatrix blocks service worker even if it's disabled

[AFE-GmdG]

uMatrix blocks service worker even if uMatrix is disabled

Intro

Hello, I'm one of the developers of just-run.it and we're using service workers for some caching and offline features. Since, I'm the only one in our team which is using uMatrix. I found some weird behavior of uMatrix in conjunction with service worker:

Environment

Windows 10 Pro Google Chrome, Version 64.0.3282.119 (Offizieller Build) (64-Bit) uMatrix 1.3.2

relevant uMatrix Settings

https-strict: * true
https-strict: behind-the-scene false
matrix-off: about-scheme true
matrix-off: chrome-extension-scheme true
matrix-off: chrome-scheme true
matrix-off: localhost true
matrix-off: opera-scheme true
referrer-spoof: behind-the-scene false
* * * block
* * css allow
* * frame block
* * image allow
* 1st-party * allow
* 1st-party frame allow

matrix-off: just-run.it true

Steps to reproduce

• Open the editor in the website just-run.it/editor
  • maybe you're blocking some scripts, so the site may not work correct.
• Disable uMatrix (or use the configuration from above)
• Open the developer tools, and clean the network tab
• reload the page

expected behavior

Just run it work correctly

actual behavior

Just run it failed to load the service worker with a error in the console Failed to load resource: net::ERR_BLOCKED_BY_CLIENT

additional tests

If you deactivate the uMatrix addon at all in the chrome addon settings page the website is running correctly.

additional screenshots

[gorhill]

You removed built-in rule matrix-off: behind-the-scene true. Did you look at the behind-the-scene requests in the logger?

[uBlock-user]

Won't happen unless you add a rule like no-workers: * true or no-workers: just-run.it true