How to find out which Firefox extensions change the code of a web page?

Question

Mozilla Firefox

Some sites do not work correctly in the browser, in particular, this applies to javascript components, for example, time.com does not scroll, and onehourtranslation.com does not display the form to start the project. Previously, all this was, and it works in other browsers. I suspect I put something extra, or some extension was bought out, and they began to monetize, for example, replacing direct links to sites with affiliate ones, etc. I believe some extension does it incorrectly and messes up the code. Are there any tools besides "disabling one at a time" to see exactly which extensions are interfering with a page's code? Ghostery is installed, but temporarily disabling it does not help.

Answer 1

Firebug
Look, Firebug allows you to track changes in the page code, in many cases plugins connect some resources, often internal ones. In this case, it's the download image.
The path contains the resource:// scheme, and the first part matches the name of the plugin.
Well, finding out the name of the plugin is a matter of technology (this is a regular archive that is unpacked and the configuration file is pulled out from there). What if the html gets corrupted anyway, but there are no internal resources. You need to find the fragment that breaks, Firebug allows you to track changes and errors. There is also an error console in the browser, you can also peep through it. You can also track network requests on the Net tab. "Left" queries are easy enough to see.
Next, copy the installed plugins to a separate folder, unpack them all and look for the fragment of the address where the request was sent (find/grep). It will probably be found in some file.
For all my life, Firebug broke only Google maps, and then, in script debugging mode. It's usually off.
In general, I recommend that you use 2 profiles in the browser, one for work, the other for surfing. Firefox allows this.

Answer 2

I solved my problem. In all cases there was a problem with "NS_ERROR_FILE_CORRUPTED", which (after googling) means that I had a broken Local Storage database in the profile, I deleted it and restarted Firefox.
But the actual question remains, are there any tools that allow you to analyze what is being done with a web page and Firefox extension traffic?