Disabling loading specific JavaScript files with Firefox

Question

I am looking for a way to prevent loading a specific JavaScript file on a website for any website of choice, with Firefox.

For example: Say I don't want to load jQuery (when loading the page, not afterwards 'disabling' it). I then want to be able to set that

http://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js

should not be loaded. The browser should complete ignore this to debug other JavaScript on the website. I don't have access to the domain directly, so that is why I am trying to do this via the browser.

So for clarity: :) I don't want to disable scripts from a certain domain, but want to be able to disable certain scripts. It can be that 10 scripts are on 1 domain, so killing all 10 of them is not what I want; in that case I want to prevent loading only one.

Is there a way to do so?

Related: Is there a built-in feauture of Firefox allowing to filter webpage's resources being downloaded? — Piotr Dobrogost
– Piotr Dobrogost, Commented Nov 26, 2011 at 14:54

xxx · Accepted Answer · 2011-09-13 18:33:05Z

18

Several options:

Use the Addon "Adblock Plus". It will probably still accesses the js but does not execute it.
Use the Addon "Greasemonkey", which - when cofigured right - does not even touch the js-url. But its generally harder to configure right. ;)
Have a look at Firefox's buildin security policies: http://kb.mozillazine.org/Security_Policies Here you can block javascript on an url or even function-level

answered Sep 13, 2011 at 18:33

xxx

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2 Comments

jakub.g Over a year ago

Indeed, AdBlock Plus is a very good tool for that kind of stuff :) The script won't even get downloaded. You can also choose to block this script only on pages in particular domain etc.

Miguel Ortiz Over a year ago

The Firefox Security policies for Javascript are discontinued since Firefox 29: support.mozilla.org/en-US/questions/1000843

noetix · Accepted Answer · 2019-03-11 01:06:41Z

2

Go to your hosts file C:\Windows\System32\drivers\etc (Windows) or /etc/hosts (Linux).

Add: 127.0.0.1 ajax.googleapis.com (separated by a tab)

And reopen your browser This way the jQuery file will fail to load.

edited Mar 11, 2019 at 1:06

noetix

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answered Jun 9, 2011 at 11:22

Lourens

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3 Comments

Sander Over a year ago

Thanks for your answer, however this is not working if there are more JavaScripts on the same domain and you want to disable one of them. I have updated my question for clarification.

Piotr Dobrogost Over a year ago

@NiklasRingdahl It doesn't even answer the question.

mhulse Over a year ago

This worked for me! I just wanted to block a whole domain. For those wanting easy host file access on a Mac, I recommend hosts for Mac.

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