Unable to load any website on Firefox

[henk23]

Prerequisites

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

Description

As of today, Firefox 74 (macOS Mojave 10.14.6) will not attempt to load any website with uMatrix addon active. It was fine yesterday, no settings changed whatsoever.

A specific URL where the issue occurs

All URLs

Steps to Reproduce

1. Try to open any webpage with uMatrix addon active

Ruleset

Independet of the ruleset

Supporting evidence

The loading icon inside the tab will move. The console is showing nothing. The logger is literally showing tens of thousands of lines, nothing related to uMatrix though.

Your environment

• uMatrix version: 1.4.0
• Browser Name and version: Firefox 74
• Operating System and version: macOS Mojave 10.14.6

[uBlock-user]

https://www.reddit.com/r/uMatrix/comments/ftebgz/no_pages_load_on_firefox_unless_i_disable_umatrix/fm7m40w/

A fix has been added in the latest commit, so until the a new release occurs, follow those steps to un-break uMatrix.