1982762 - Unresponsive Firefox in the macOS 26

Status: RESOLVED DUPLICATE of bug 1979124

(Core :: Widget: Cocoa, defect)

Description

[RamprasadG]

Attachment: process.txt.rtf

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:142.0) Gecko/20100101 Firefox/142.0

Steps to reproduce:

1.	Open Firefox on macOS.
2.	Open around 10–15 tabs (varied websites; mix of news, email, and social media).
3.	Continue browsing for some time (10 minutes to 30 minutes).

Actual results:

•	Firefox becomes unresponsive (spinning beachball cursor).
•	UI freezes; cannot interact with tabs or menus.
•	Requires Force Quit from Activity Monitor.

Expected results:

•	Firefox should remain responsive even with 10–15 tabs open.
•	User should be able to browse continuously without needing to restart the application.

Comment 1

[RamprasadG]

Attachment: Firefox.txt

Comment 2

[BugBot [:suhaib / :marco]]

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Cocoa' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[Stephen A Pohl]

This may be a duplicate of bug 1979124. Could you try the latest nightly and check if this is still occurring?

Comment 4

[RamprasadG]

The nightly works fine. Additionally, the change of “network.trr.mode” works fine in my 142.

Comment 5

[Stephen A Pohl]

Thanks for confirming!