[G4.0.6] Inexplicable `Paused on XMLHttpRequest`

[DonielMoins]

What happened?

#A bug happened!

A “Paused on XMLHttpRequest” breakpoint triggers with no breakpoints set. It is… very annoying when I have to work with web sockets on a daily-basis.

So this happens when I open the “DevTools” menu and open either the debugger or the Network tab. I used my same FF sync account on another Waterfox instance (same version) on a Windows machine, out of desperation, and it wasn't happening again.

This issue is NOT site specific, and I have disabled all relevant breakpoint options from every option menu I can find. I made sure to test if this still persists with all extensions disabled (pretty sure this was a while ago).

Furthur testing shows that this problem does not still occur in Private Browsing mode.

I will attach any relevant screenshots and logs I can think of. If you need any other information, please don't hesitate to ask.

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this.content = { XMLHttpRequest: window.XMLHttpRequest, fetch: window.fetch.bind(window), }; window.JSON = JSON; window.XMLHttpRequest = XMLHttpRequest; window.fetch = fetch;

Funnily enough, I found this suspicous ExtensionContent.jsm under resource://gre/modules (shown in the image below) but I doubt it has any relation since it is also present in PB mode.

Here is where it breaks in the jQuery JS file. Seems like a normal XHR request right?

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##XHR related settings here

##Other settings:

I'm fairly certain I caused this but forgot what setting I changed after a long break from web development. But at this point... I am despairing. I cannot find how to fix this.

Thank you all,

• F H

Reproducible?

• [x] I have tested this on Firefox.

Version

G4.𝑋 (Future)

What platform are you seeing the problem on?

Linux

Relevant log output

23:34:31.390 Unchecked lastError value: Error: Could not establish connection. Receiving end does not exist. 2 background.js:2807 23:34:31.597 Resource of root-node was not found. resource-command.js:724:17 23:34:31.646 Unchecked lastError value: Error: Could not establish connection. Receiving end does not exist. 2 background.js:2807 23:34:31.926 Unchecked lastError value: Error: Could not establish connection. Receiving end does not exist. 2 background.js:2807 23:34:32.910 Use of nsIFile in content process is deprecated. 2 NetUtil.jsm:253:8 23:34:32.951 Use of nsIFile in content process is deprecated. NetUtil.jsm:253:8 23:34:33.099 Error: Can't find profile directory. 2 XULStore.jsm:66:15 23:34:33.351 Unchecked lastError value: Error: Could not establish connection. Receiving end does not exist. 2 background.js:2807 23:34:33.950 Unchecked lastError value: Error: Could not establish connection. Receiving end does not exist. 2 background.js:2807 23:34:52.794 Type error for parameter tabId (Integer -1 is too small (must be at least 0)) for tabs.get. background.js:511

[DonielMoins]

Adding upon the "Can't find profile directory" error. 23:34:33.099 Error: Can't find profile directory. 2 XULStore.jsm:66:15 load resource://gre/modules/XULStore.jsm:66 XULStore resource://gre/modules/XULStore.jsm:24 enter resource://devtools/server/actors/utils/event-loop.js:79 enter self-hosted:1175 _pushThreadPause resource://devtools/server/actors/thread.js:334 _pauseAndRespond resource://devtools/server/actors/thread.js:956 _onOpeningRequest resource://devtools/server/actors/thread.js:782 _onOpeningRequest self-hosted:1175 jQuery 2 Ajax http://server01.evilcorp.wg/js/rtorrent.js:1167 requestWithoutTimeout http://server01.evilcorp.wg/js/webui.js:2615 getUISettings http://server01.evilcorp.wg/js/webui.js:331 success http://server01.evilcorp.wg/js/rtorrent.js:1232 jQuery 6 Ajax http://server01.evilcorp.wg/js/rtorrent.js:1167 requestWithoutTimeout http://server01.evilcorp.wg/js/webui.js:2615 getPlugins http://server01.evilcorp.wg/js/webui.js:314 init http://server01.evilcorp.wg/js/webui.js:222 <anonymous> http://server01.evilcorp.wg/js/webui.js:2672 jQuery 8

[adamp01]

@DonielMoins - So with a fresh profile this issue does not occur?

[DonielMoins]

nope. but that still begs the question, how did I mess this up so bad that even after days of rummaging through settings, I couldn't fix it without a 'hard reset'. I wish I could have backed up my corrupted waterfox...

[DonielMoins]

Sorry I'm about to head to sleep rn, but I think I did back it up just to fix it properly later on. So maybe we can help so.eone out later on? I hope you don't mind this, I think it would be extremely beneficial. Might even be able to fix a bug or improve a broken part of Firefox? Or serve as a guide at the very least.

[adamp01]

If you can send me a list of modified preferences in your broken profile I'm happy to have a look through and see if anything stands out.

[DonielMoins]

Weirdly, the only files related I can find are .js suffixed. Are the prefs*.js files the ones you're talking about?

If you can send me a list of modified preferences in your broken profile I'm happy to have a look through and see if anything stands out.

[adamp01]

@DonielMoins - apologies for the really late reply here - yeah the contents of prefs.js in your main profile would be what I'm after here.

[allan-bonadio]

I've got a similar thing happening. On Windows. And, a similar request I'm developing at this time, doesn't stop there. v114 firefox.

OOps! my mistake. 'XHR Breakpoints' > "Pause on any URL" was on. Maybe that's the problem.