we are running a private instance (patched to run tests with multiple steps) based on official version 2.18.
Firefox tests are broken on our desktop agents since version 43 of Firefox cause of new default false of setting xpinstall.signatures.required.
We fixed that by adding the following to prefs.js:
I wonder why this isn’t set in HEAD of webpagetest’s github master branch. Is it possible to get webpagetest FF plugin signed?
I read setting xpinstall.signatures.required will possibly be disabled in version 45.