User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:51.0) Gecko/20100101 Firefox/51.0 Build ID: 20170118123726 Steps to reproduce: I am using userContent.css. Actual results: After upgrading to Firefox 51 this file is not loaded. Expected results: Firefox should respect userContent.css content.
could you attach your userContent.css, please. Did you test with a fresh profile to see if it's loaded? https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
I don't think it's caused by content of file, when versions 50 and lower are OK. In my opinion it's caused by default enabling e10s in version 51 with addons. When I disable e10s, userContent.css works again.
Fixed in 52+.
Status: UNCONFIRMED → RESOLVED
Closed: 2 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1046166
The workaround is turning off e10s. (Flip the "browser.tabs.remote.autostart.2" pref.)
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