CODEWITHSUNDEEP
debuggingfirefoxfirefox-developer-tools
Johannes
Johannes

Reputation: 67738

Firefox hangs when using developer tools

I am getting a little desperate here: Almost every time I try to use the Firefox browser tools (FF 66.0.3 on Mac, but has been the same in previous versions) to inspect an element, when selecting any page element to show its code in the inspector, the inspector switches to the javascript debugger, marks an error in the jquery.min.js file (complete first line of three) and causes the browser to hang, i.e. I can still scroll the window, but more or less nothing else (for example no reload, no clicking a link would work etc.)

The debugger shows Error: Permission denied to access property "nodeName". I am doing nothing special, I just use the inspector and try to select any element on the page.

The crazy thing is that this happens on most websites, even here on Stackoverflow, so I suppose some particular browser setting must cause this.

I know this is a vague description and therefore a bit off-topic, but I'd be very grateful for any hints how I could fix this.

Upvotes: 0

Views: 4033

Answers (1)

Kaiido
Kaiido

Reputation: 136598

You most probably have the "Pause on exceptions" and "Pause on caught exceptions" options set to on:

screenchot of the debugger panel

These will cause the debugger to pause javascript execution whenever an exception is thrown, even though the exception has been caught e.g by a try catch block, like many test codes use.

You can un-toggle these to enjoy a more natural experience or click the play icon to resume the javascript.

Upvotes: 3

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