I just noticed this today. Sometimes when loading a tab its titlebar remains empty of text (but the favicon is still there) for upwards of 15-20s. It doesn't happen all of the time - about 80% I'd say. Couldn't find anything in the error console about it. I've been able to repro through middle clicking an existing page link and ctrl-clicking a bookmark.

Is this URL specific? Can you share those URLs? I think it might be related to bug 583890.

Well, Bugzilla for one. I loaded this bug by clicking the link in Thunderbird. Then I loaded bug 583890 by middle clicking the link in your comment. I think I've experienced it on yammer too.

I also just noticed that the page title doesn't refresh until I switch to the tab.

Does setting 'browser.tabs.cropTitleRedundancy' to 'false' fix the issue?

(In reply to Tim Taubert [:ttaubert] from comment #4) > Does setting 'browser.tabs.cropTitleRedundancy' to 'false' fix the issue? I did a quick test with 5-6page loads and it seems to have.

Ok, thank you. I'll mark this as a regression then.

Were any addons in use? Clean session and clean profile? I'm trying to reproduce, but haven't found a way so far. What it sounds like would be the |TabLabelModified| event getting lost, but the fact that it gets labeled on switch to tab may indicate something else is going on.

(In reply to Adam [:hobophobe] from comment #8) > Were any addons in use? Clean session and clean profile? > > I'm trying to reproduce, but haven't found a way so far. > > What it sounds like would be the |TabLabelModified| event getting lost, but > the fact that it gets labeled on switch to tab may indicate something else > is going on. Yes, I do have some addons: A Bit Better RTM Adblock Plus Add-on Compatibility Reporter BugzillaJS Bugzilla Tweaks Check4Change Download Statusbar Firefox Share FoxClocks HTTPS-Everywhere It's all Text! Lazarus: Form Recovery Menu Icons Plus MoCo Authorizer PDF Viewer Status-4-Evar Stylish Tile Tabs I'm having trouble repro'ing now after changing the pref back. I'm also unable to repro on a clean profile. I'll leave the pref flipped and continue to see if I can repro.

I repro'ed a few more times today in my non-clean profile. It appears to happen more when the browser is loaded (loading multiple tabs at once, for example).

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.

I'll try to repro with that build sometime today, thanks!

FWIW, this bug seems to have gone away for me (ABICT)

Now that you mention it, I can't repro anymore either. Possibly related, browser.tabs.cropTitleRedundancy doesn't exist in about:config anymore, either.

The preference browser.tabs.cropTitleRedundancy (and the bug) should only be in the try build. The feature was backed out from nightly, so the bug won't be there. The bug should show up in in the try build, and you should see the sort of output I mentioned (again, if the preference browser.dom.window.dump.enabled is on).

(In reply to Adam [:hobophobe] from comment #15) > The preference browser.tabs.cropTitleRedundancy (and the bug) should only be > in the try build. The feature was backed out from nightly, so the bug won't > be there. Since bug 583890 was backed out, please re-nominate if it relands.