User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:49.0) Gecko/20100101 Firefox/49.0 Build ID: 20160916101415 Steps to reproduce: Open new tab (about:newtab or about:blank). Right click, open Inspect Element. Type a website into the address bar. Actual results: The Inspect bar closes. Expected results: Inspector should stay open, loading console and network info from the visited website. It stays open correctly when browsing for the Private Window page about:privatebrowsing
I can't reproduce it with FF49 on Win 7. Is it reproducible with a clean profile? https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
(In reply to Loic from comment #1) > I can't reproduce it with FF49 on Win 7. > > Is it reproducible with a clean profile? > https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove- > firefox-profiles On Mac OS X, yes, I reproduced it with a clean profile. Can't reproduce on Linux or Windows.
Maybe it's a bug specific to the OSX version. Are you able to reproduce the issue in previous versions of Firefox?
AFAIK, the new tab page is loaded in the parent process with e10s, while web content is loaded in the content process. At the moment we're not able to keep the toolbox open when switching processes like that.