1959282 - 137.0.1 update and now won't load any sites on Mac 15.4 sequoia

Status: UNCONFIRMED

(Core :: Widget: Cocoa, defect, P3)

Description

[ppendler]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Safari/605.1.15

Steps to reproduce:

deleted and reloaded software
downgraded security

Actual results:

same problem, websites won't load yet load everywhere on other browsers

Expected results:

didn't open just kept trying to load websites

Comment 1

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

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 2

[Haik Aftandilian [:haik]]

@ppendler, thanks for the report. A quick thing to check: please verify Firefox is not blocked by the macOS Firewall. You can check this in the macOS System Settings -> Network -> Firewall -> Options.. screen. Alternatively, try temporarily disabling the firewall. In early releases of macOS Sequoia, there were known issues with the macOS firewall which have been since resolved, but checking this would let us rule out a similar problem.

Comment 3

[ppendler]

thank you for prompt reply. I am asking about two computers - one with sequoia (and do have firewall on)

the issue that prompted my request for help is wife's older mac air running big sur 11.7.10

• firewall is on; i toggled it off and same problem with new firefox update - no sites are loading, no error messages.

Apologies for not including both computers and OS

please respond to the 11.7.10 OS question with the firefox update?

Comment 4

[Markus Stange [:mstange]]

Could you capture a network log from about:logging as described on https://firefox-source-docs.mozilla.org/networking/http/logging.html#using-about-logging ?

You can attach the file to this bug or send it to [e-mail] if there are private URLs in it.

Comment 5

[zoster.spray.6a]

Attachment: console-export-2025-4-9_17-41-10.txt

This is the console dump from my initial failure and then eventual success

Comment 6

[Stephen A Pohl [:spohl]]

(In reply to zoster.spray.6a from comment #5)

Created attachment 9478163 [details]
console-export-2025-4-9_17-41-10.txt

This is the console dump from my initial failure and then eventual success

This console dump unfortunately doesn't tell us much. Could you please follow the instructions in comment 4 and provide a network log (not console log)? Thank you

Comment 7

[steele.tom]

I am having the same issue. After restarting my iMac, my Firefox upgraded to 137.0.2 and simply refuses to load any websites. Downgrading to 135 fixes the issue (but creates a new profile).

Comment 8

[steele.tom]

Attachment: log.txt.moz_log.0

HTTP log

Comment 9

[Stephen A Pohl [:spohl]]

Could you tell us what version of macOS your system is running? Are there any pending macOS updates? If these updates are applied (if any), does the problem still occur?

Comment 10

[steele.tom]

macOS Monterey 12.7.6

i'm honestly surprised it's such an old version; i would've expected it to prompt me to upgrade several times by now! i can't update until this evening, though, because i'm working at the moment.

Comment 11

[steele.tom]

OK, now running Sequoia 15.4.1, same issue — still cannot load any website using Firefox 137.0.2

Comment 12

[Stephen A Pohl [:spohl]]

Do you recall being prompted to give Firefox access to the local network and devices? Have you tried the steps in comment 2? Does the problem persist?

Comment 13

[steele.tom]

Nope, no prompt for network/device access.

The macOS firewall is inactive, so that's unfortunately not the issue.

Comment 14

[steele.tom]

An update:

• I left the browser minimized and after a lengthy period (more than 24 hours), it worked as usual. No issues loading anything.
• I restarted the browser, and it reverted to refusing to load any website.
• I continued to check periodically to see if this changed. After about 20 hours, it was behaving as normal again (it may have been less than this, because I was asleep for part of the time, but it was definitely more than 8 hours).

Comment 16

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

Redirect a needinfo that is pending on an inactive user to the triage owner.
:spohl, since the bug has recent activity, could you please find another way to get the information or close the bug as INCOMPLETE if it is not actionable?

For more information, please visit BugBot documentation.