User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0 Build ID: 20180103231032 Steps to reproduce: 1. Open network monitor in devtools 2. Right click on table header and add new column (for example Content-Encoding) Actual results: Columns in the header is not aligned with columns in the table (columns are shifted). Expected results: Columns in the header should be aligned with columns in the table

This is screenshot network monitor in Firefox Nightly 59.0a1 (2018-01-10) (64-bit) after fix https://bugzilla.mozilla.org/show_bug.cgi?id=1360457

Thanks Eugene for creating this bug. However, as I commented in https://bugzilla.mozilla.org/show_bug.cgi?id=1360457, this is unrelated, as the bug you are reporting was already present in versions of Nightly that were built before the bugfix for 1360457.

Comment on attachment 8941796 [details] Bug 1429721 - Ensure all netmonitor columns have a default width. https://reviewboard.mozilla.org/r/212050/#review218026 Thanks ntim! I like the test cases cleanup. I've verified this issue get fixed properly. ::: devtools/client/netmonitor/test/head.js:693 (Diff revision 3) > resolve(msg); > }); > }); > } > > +async function testColumnsAlignment(headers, requestList) { nit: remove async

Pushed by ntim.bugs@gmail.com: https://hg.mozilla.org/integration/autoland/rev/76d24a5414eb Ensure all netmonitor columns have a default width. r=rickychien

Backed out for devtools failure on browser_net_headers-alignment.js Log: https://treeherder.mozilla.org/logviewer.html#?job_id=155855181&repo=autoland&lineNumber=7520 Rev: https://hg.mozilla.org/integration/autoland/rev/74e94759584cda78f2c715bbb8a5c3ab1c524e37

Pushed by ntim.bugs@gmail.com: https://hg.mozilla.org/integration/autoland/rev/1fc038162868 Ensure all netmonitor columns have a default width. r=rickychien