1279979 - XML Parser error: undefined entity - chrome://browser/content/browser.xul, line 560, column 9: <button id="editBookmarkPanelDeleteButton" --------^

Status: RESOLVED INCOMPLETE

(Firefox :: Untriaged, defect)

Description

[Guo Yunhe]

User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36

Steps to reproduce:

When I start Firefox, it just popup a small dialog with:

XML 解析错误：未定义的实体
位置：chrome://browser/content/browser.xul
行 560，列 9：        <button id="editBookmarkPanelDeleteButton"
--------^

This happens after an update.

Comment 1

[:Gijs (he/him)]

Can you try restarting Firefox in safe mode - https://support.mozilla.org/kb/troubleshoot-firefox-issues-using-safe-mode ? I suspect that will clear this up, with the issue potentially caused by add-ons that you're using.

Comment 2

[Guo Yunhe]

I have tried three solutions:

1. Restart Firefox in safe mode: No effect, still have the same problem.
2. Restart using another user profile: this works, but after set new profile as default profile, cannot start Firefox again.
3. Restart computer: This works and the problem disappeared for a long time.

I found new Firefox 47 always produce a zombie process. This zombie process might have some relation to this problem I had.

Comment 3

[Adrian Florinescu [:aflorinescu]]

Guoyunhebrave, might you by any chance using a localized version of Firefox? 
The problem you are reporting looks similar with the one reported in Bug 1255584.

I'm inclined on having the same suspect as Gijs: one of your addons, although I'm a bit confused about why the problem would go away if you restart your computer.

Also, 
(In reply to guoyunhebrave from comment #0)
> This happens after an update.
Does this mean that in FF 46 this problem didn't exist?

Comment 4

[Adrian Florinescu [:aflorinescu]]

47.0.1 Build ID 20160623154057
Reading again Comment2 point2, I thought to look a bit around profile management, but no joy. I couldn't identify any "zombie" process. TBH, I'm not exactly sure how to interpret that other than imagining that a second (idle?) Firefox process would pop-up (might be this related to some particular actions? hidden pop-ups?).

Given the above comment and comment3, I think we do not have anything actionable at this point, therefore marking this issue as incomplete for the time being. 

Guoyunhebrave, please reopen this issue when you have new information to help us identify and possibly reproduce this bug.

Comment 5

[Guo Yunhe]

Cannot reproduce this problem. I remember that I was using Firefox, then my system updated the MozillaFirefox package when it is still running. And then I closed Firefox and try to restart it, it throw the error window all the time. Then I look into Firefox process in system monitor, I found that even though I am not running Firefox, here is a zombie process of firefox. After restart computer, I think I killed the process. And Firefox works fine.

I guess this problem only happens when updating Firefox but didn't stop it.

After I solved the problem, I still find zombie process, from Firefox 46 to 48. But it doesn't have any side effect for me:

http://imgur.com/a/SV3kL