When I open a new tab and load a page in it, the title seems to get stuck on "Connecting". I'm running a build with the patches in bug 583890, and I am going to make an educated guess blaming that bug for this problem.

When this happens, I see the correct title in the tab tooltip.

Still cannot reproduce; it would be very helpful if those who can would to gather some debug data. Debug-patched try builds at: https://ftp.mozilla.org/pub/mozilla.org/firefox/try-builds/unusualtears@gmail.com-252fb3befbde/ If you'd rather build it yourself, the debug patch is included with the other two patches on bug 583890 (or use mercurial to pull the revision off try). You'll need to flip the preference |browser.dom.window.dump.enabled| to |true| to get the output. Output will be similar to: ===ABRIDGMENT---FOR: [some URL]=== ---ABRIDGMENT---BEGIN---HERE--- [...] ---ABRIDGMENT---END---HERE--- When you see a tab that has either no label or "Connecting...", you can look for the URL of the tab in the terminal output. Include the output here, any coinciding errors from the error console, and what the tab displayed (either "Connecting..." or no label). No need to include the "===ABRIDGMENT---FOR: http://...===" line.

(In reply to comment #2) > Still cannot reproduce; it would be very helpful if those who can would to > gather some debug data. So I downloaded and ran your build, and couldn't reproduce this time. I'll keep running your build for a couple of days to see if I can reproduce.

Thanks Ehsan. Just to confirm, you're still seeing the output even though the actual bug isn't showing itself?

(In reply to comment #4) > Thanks Ehsan. > > Just to confirm, you're still seeing the output even though the actual bug > isn't showing itself? Which output?

You should see output like "---ABRIDGMENT..." in the terminal if |browser.dom.window.dump.enabled| is |true|. This happens when the tabset changes, during normal browsing, etc. (The try build adds |dump| calls along the feature's code path, to try to determine where and how the bug was happening.)

(In reply to comment #6) > You should see output like "---ABRIDGMENT..." in the terminal if > |browser.dom.window.dump.enabled| is |true|. This happens when the tabset > changes, during normal browsing, etc. (The try build adds |dump| calls along > the feature's code path, to try to determine where and how the bug was > happening.) Oh, right, yes, I am seeing those lines.

Firefox 50.0a1, Build ID 20160705030222 User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:50.0) Gecko/20100101 Firefox/50.0 I have tested this issue on the latest Firefox (47.0.1) release and the latest Nightly (50.0a1) build, but I could not reproduce it. The title does not remain stuck on "Connecting", or after the page is loaded the "New Tab" title does not change in "Connecting". Ehsan, is this issue still reproducible on your end on the latest Firefox version?