1592146 - "A web page is slowing down your browser" bar appears underneath the navigation toolbar

Status: UNCONFIRMED

(Toolkit :: PopupNotifications and Notification Bars, defect, P3)

Description

[Oleksii Segeda [:Sound]]

Attachment: Screen Shot 2019-10-28 at 7.00.34 PM.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:72.0) Gecko/20100101 Firefox/72.0

Steps to reproduce:

Open anything memory-intensive

Actual results:

The "A web page is slowing down your browser" bar is partially rendered in Nightly on Mac (see screenshot).

Expected results:

The bar should be displayed properly

Comment 1

[Andre Klapper]

Please tell us which theme you are using, and if this also happens with the default Firefox theme.

Comment 2

[Oleksii Segeda [:Sound]]

(In reply to Andre Klapper from comment #1)

Please tell us which theme you are using, and if this also happens with the default Firefox theme.

No theme, this is the default Nightly look and feel on Mac.

Comment 3

[Gingerbread Man]

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0
20191030215116

(In reply to Sound from comment #0)

Open anything memory-intensive

I entered while (0<1) document.write("Hello world!"); into the console. The notification bar opened at the correct position. Setting platform to macOS.

Comment 4

[Oleksii Segeda [:Sound]]

(In reply to Gingerbread Man from comment #3)

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0
20191030215116

(In reply to Sound from comment #0)

Open anything memory-intensive

I entered while (0<1) document.write("Hello world!"); into the console. The notification bar opened at the correct position. Setting platform to macOS.

I think the console won't do it. Can you try on crashsafari.com or something similar?

Comment 5

[Gingerbread Man]

(In reply to Sound from comment #4)

Can you try

That locked up my whole system before I had a chance to forcibly close Nightly. I don't advise anyone else to try that link.

Comment 6

[BugBot [:suhaib / :marco/ :calixte]]

The priority flag is not set for this bug.
:MattN, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 7

[Matthew N. [:MattN]]

Can you please find a regression range? https://mozilla.github.io/mozregression/

Comment 8

[Oleksii Segeda [:Sound]]

(In reply to Matthew N. [:MattN] (PM me if requests are blocking you) from comment #7)

Can you please find a regression range? https://mozilla.github.io/mozregression/

How far back in time I should go? I'm observing this bug in builds from 2016. Is there a specific date when this yellow bar was added?
Also this tool is kinda clunky on macos.

Comment 9

[BugBot [:suhaib / :marco/ :calixte]]

Bugbug thinks this bug is a regression, but please revert this change in case of error.

Comment 10

[Matthew N. [:MattN]]

(In reply to Sound from comment #8)

(In reply to Matthew N. [:MattN] (PM me if requests are blocking you) from comment #7)

Can you please find a regression range? https://mozilla.github.io/mozregression/

How far back in time I should go? I'm observing this bug in builds from 2016. Is there a specific date when this yellow bar was added?

Thanks, that's far enough back so we don't need to treat this as a regression as it may have always had this problem.

I wonder if this notification bar is still using JS (instead of CSS) for the animation.

Also this tool is kinda clunky on macos.

I've only used the command line version but I assume you're talking about the GUI version. Feel free to file issues on it from https://github.com/mozilla/mozregression#issue-tracking