673200 - One tab missing from a few windows upon restore

Status: VERIFIED INVALID

(Firefox :: Session Restore, defect)

Description

[Alison]

Attachment: page-without-a-tab screenshot

When I close Firefox via File > Exit, I have things set to "save & quit" (it doesn't ask me anymore, it just does it).  Every time I close Firefox and I had multiple windows, with multiple tabs each, upon restore there is 1 tab "missing" from 1 or more windows -- I've never experienced 1 tab missing from every window, though.  Last few times it's been 3 out of 5 windows.  I have not been able to reproduce this issue with just 1 window open when I close/restore Firefox.

Windows with 1 tab missing: The missing tab is always the first, left-most tab.

I can get to the missing tab's page by Ctrl+Tab'ing through my tabs, but this page does not have a tab (so when I Ctrl+Tab my way to the page, I have no "active"-looking tab at that time).  In addition, when I click F6 when I'm on a page WITH a regular tab, the tab is selected and I have to click my Tab key once to get to the URL/location field -- this is not the case when I'm on the page-without-a-tab.  When I'm on the page-without-a-tab and I click F6 the URL/location field is selected right away.  I can close the page-without-a-tab in the normal fashion, Ctrl+w.  To deal with the issue O usually just close the page-without-a-tab and open the same URL in a new tab.

I have experienced this problem with windows with App Tabs and windows without (and it does happen even if none of my windows have App Tabs).  When I used to use App Tabs the problem was even more annoying because my left-most App Tab would be the missing tab, and I couldn't close this tab (with the intention of opening the URL in a new tab) via Ctrl+w.  In these cases I had to close my whole window (but not close Firefox) and start the window open (so I would Bookmark All Tabs beforehand).

Lastly, if I don't close the page-without-a-tab and open the URL in a new tab and close/restore Firefox, the page-without-a-tab is still there, and no new tabs have gone "missing."

Attached is a screenshot of me on a page-without-a-tab -- note no active tab among the tabs at the top.

Comment 1

[Alison]

Of course I forgot 2 details...

(1) when I list all tabs (via URL Lister), page-without-a-tab is in the list, and it's at the top of the list.
(2) I know that this bug is similar to https://bugzilla.mozilla.org/show_bug.cgi?id=667283 -- I tried to do what that user did to fix the issue (disable the extension "openSUSE Firefox Extensions 1.0.1."), but I can't find this extension to disable it.  I searched the googles for where it can be disabled, and the answer there was that it's in the same place as all my other add-ons, but it isn't there when I looked.  Seems like I must be missing something that's right in front of me, so if anyone can tell me where to look, I will try this fix.

Thank you!

Comment 2

[u279076]

Do you have the Readability add-on installed? If so, this is likely a dupe of bug 672780. If not, please try running Firefox in safe-mode to determine if an add-on is causing this issue.

Comment 3

[Alison]

Thanks so much for the quick response.  I do not have that add-on installed.  I will try safe-mode as you suggested and report back here.

Comment 4

[Alison]

Well that was quick... Everything worked fine in Safe Mode, so I tried disabling add-ons one at a time.  First one I tried fixed it.  I tried enabling it and disabling a couple others one at a time because I didn't believe it, but it was definitely just the first one, "Tab To Window" https://addons.mozilla.org/en-US/firefox/addon/tab-to-window/

From a lay-person's perspective it seems worth noting that this problem seems to be caused by a few different add-ons (maybe at least 3, including the bug you linked to and the one I liked to in my first comment).  I don't have a "therefore" to go with that thought, but I would think that it's more likely that these add-ons have something in common than this just being a coincidence, right?...

I'm looking for where the Tab To Window developer wants bugs to be reported, though I'll probably end up just removing it because there's already a "move to new window" option in the context menu...  Anyway, thanks again for the quick response.

Comment 5

[Paul O'Shannessy [:zpao] (not bugmail, email directly)]

Add-on related, so marking INVALID.

Alison, thanks for filing and helping figure out the issue!