1161290 - Tabs don't load properly with the preloaded new tab page in e10s

Status: RESOLVED WORKSFORME

(Firefox :: Tabbed Browser, defect)

Description

[Matthew N. [:MattN]]

After some time in :gkw's session on Nightly with e10s, tabs opened with Command-T or File => New Tab load as tabs with no title (nothing at all, not even "New Tab") and the error in the Browser Console is:
browser.attachFormFill is not a function (tabbrowser.xml:1575)
which refers to the call in _getPreloadedBrowser
https://mxr.mozilla.org/mozilla-central/source/browser/base/content/tabbrowser.xml?rev=c72beadc2bc6&mark=1579#1560

Once the session is in this state it seems like there isn't a way to get new newtab tabs to work again. Links clicks from external applications and opening a new tab for a link click still work fine. This plus the stack is why I think it's related to new tab preloading (browser.newtab.preload = True) and could be caused by one of the extensions.

Nightly 40.0a1 (2015-05-01)

Comment 1

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

Attachment: about:support data

Comment 2

[Tracy Walker [:tracy]]

Gary, I cannot reproduce this with latest Nightly.  Are you able to reproduce with a clean profile?

Comment 3

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

It hasn't happened in safe mode yet, in the 24 hours I have been testing safe mode at :MattN's suggestion.

This is an intermittent issue, and there are no reliable steps to reproduce.

Comment 4

[Mike Conley (:mconley) (:⚙️)]

Unfortunately, safe mode isn't a great test bed, since safe mode disables e10s.

If you're looking to see if add-ons are the cause, you'll need to disable them manually instead.

Comment 5

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

I've disabled Camelizer 2.5 in my add-ons - so far I've not seen it yet. However, I'm intermittent over the next few weeks but I'll try and see if I see it when I'm online at night.

Comment 6

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

There was once where I hit this without Camelizer activated, on Nightly. It seems a lot harder to hit although it hasn't completely gone away.

Comment 7

[Mike Hommey [:glandium]]

I've hit this a couple times already on current Aurora, and in the past on aurora too. On Linux.

Comment 8

[Jerod Lycett]

I just tested this with >600 tabs. Can this still be replicated with no addons?

Comment 9

[Andy McKay]

Based on the last comment and the age of this bug, assuming its fixed. If that's inaccurate, please reopen or comment and we'll get it tested.