1203718 - Inspector tree view disappears after a period of use

Status: UNCONFIRMED

(DevTools :: Inspector, defect, P3)

Description

[Dethe Elza]

Attachment: Expected, normal view

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:40.0) Gecko/20100101 Firefox/40.0
Build ID: 20150826023504

Steps to reproduce:

I haven't been able to find a concise test case other than just keeping developer tools open (possibly having it open in several tabs is a contributing factor?) open for a substantial period of time while making updates, reloading the page, normal developer use. I frequently (and across multiple computers and Firefox versions, have seen this for more than a year and still see it in FF40) have the DOM (tree) view of the inspector disappear. I still see the breadcrumbs view.

Things which do not bring back the DOM view:

* Switching tools in the developer tools
* Moving around elements in the breadcrumbs header
* Right-click (ctrl-click) on element in page and choose "Inspect Element"
* Using the element picker tool to choose an element to inspect

Note: all of these work fine, they just don't restore the missing view.

What does seem to work at least most of the time (I think I remember this not working in older versions, but haven't experienced it lately):

* Close developer tools, re-open.


Actual results:

DOM view vanishes, stubbornly won't come back (see screenshots).


Expected results:

I should keep being about to work with the DOM view even if I keep Developer Tools open for a long time.

Comment 1

[Dethe Elza]

Attachment: Vanished DOM view

Comment 2

[Patrick Brosset <:pbro>]

Bug triage (filter on CLIMBING SHOES).
Triaging as a P3 because there doesn't seem to be simple steps to reproduce.
I haven't seen bugs about the markup-view being empty in a long time. The only one that comes to mind is bug 1027055 which is related to built-in error pages. Whenever one of those pages is encountered, the markup-view hits an error and gets empty.

Comment 3

[random_n0body]

I'm having the same issue: https://imgur.com/a/TAdNuJC in firefox 98.0.2 (64-bit) as well as 99.0b8 (64-bit)

It happens sometimes and it's really annoying

Comment 4

[random_n0body]

There are the following errors when inspecting the devtools: https://imgur.com/a/1OPlbCg

Maybe that helps?

Comment 5

[piquark6046]

I am having the same issue: https://imgur.com/a/yB2b8l0

Comment 6

[piquark6046]

Attachment: Example in https://m.sedaily.com

Approval Request Comment
[Feature/Bug causing the regression]:
[User impact if declined]: causes annoyances
[Is this code covered by automated tests?]:
[Has the fix been verified in Nightly?]: I am not sure
[Needs manual test from QE? If yes, steps to reproduce]: Just open DevTool inspector before visiting.
[List of other uplifts needed for the feature/fix]:
[Is the change risky?]:
[Why is the change risky/not risky?]:
[String changes made/needed]:

Comment 7

[piquark6046]

Attachment: Environment data

Comment 8

[Mary]

Hi, I have the same issue.
If I reload my page with the inspector open, the content of inspector disappear and still empty even if I made another "inspect" actions.

Comment 9

[Cyril Krylatov]

Attachment: Debug informations

Hi, I do have the same issue.