Make it possible to block prefetch, prerender, preconnect, dns-prefetch, icon

[FlorianSteenbuck]

Prerequisites

• I performed a cursory search of the issue tracker to avoid opening a duplicate issue
  • Your issue may already be reported.
  • I also searched the existing issues at https://github.com/gorhill/uMatrix/issues
• This is not a support issue or a question
  • Support issues and questions are handled at /r/uMatrix
• I tried to reproduce the issue when...
  • uMatrix is the only extension
  • uMatrix with default lists/settings
  • using a new, unmodified browser profile
• I am running the latest version of uMatrix
• I checked the documentation to understand that the issue I report is not a normal behavior
• I used the logger to rule out that the issue is caused by my ruleset

Description

This is a feature request. Make it possible to block/allow:

<link rel="prefetch"/>
<link rel="prerender"/>
<link rel="preconnect"/>
<link rel="dns-prefetch"/>
<link rel="icon"/>

A specific URL where the issue occurs

Irrelevant to the issue.

Steps to Reproduce

Irrelevant to the issue.

Ruleset

Irrelevant to the issue.

Supporting evidence

Irrelevant to the issue.

[gwarser]

This is already blocked by default, as much as API allows.

https://github.com/gorhill/uMatrix/blob/3f2916ed0599ef27fced5a7d95ef2b1074b8d758/platform/chromium/vapi-background.js#L49

[uBlock-user]

Chromium - https://bugs.chromium.org/p/chromium/issues/detail?id=786038

[identicalsnowflake]

@gwarser

It's not just blocked by default, it's blocked entirely, and changing the browser settings to enable prefetching doesn't work as this extension overwrites the setting. I can't find anything in the uMatrix settings to make it stop doing this.

I think it would make sense to expose prefetching settings in the uMatrix preferences, as enabling prefetching dramatically reduces the time it takes the browser to navigate around pages.

[gorhill]

dramatically reduces

Only actual profiling results are considered.