User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0 Build ID: 20170717063821 Steps to reproduce: Using a web extension with permission to *://api.pinboard.in/*, trying to send a fetch get request to that domain. It does not work in firefox release (v54), while working in firefox v55.0b10 dev edition and chrome. Actual results: No request is sent (according to network tab) and promise never resolved. The line of code before is executed, no error message shown Expected results: Network request gets sent and resolved.
55 is due to be released Aug 8, since report says it works there, wontfix for 54