Comments on: How to fix Ajax Error: uncaught exception: Permission denied to call method XMLHttpRequest.open

By: Jesse Hu

Jesse Hu — Fri, 09 Jan 2009 06:14:55 +0000

Works for me on Firefox 3/2 . Thanks a lot.

By: Erica Harris

Erica Harris — Wed, 12 Nov 2008 12:20:29 +0000

Many thanks, Ben, this has been a huge help to me. Thanks for the pointer to the Mozilla development site too.

By: Ben Lam

Ben Lam — Wed, 12 Nov 2008 10:27:57 +0000

Hi Erica,

Your users, if using your Salesforce app under Firefox, would have to make the same change in their browser to avoid this security based error. It basically prevents malicious code from being executed from an innocent looking domain/website.

See Mozilla’s notes on Firefox 3 and cross site scripting for more information on this later version.

I’m not familiar enough with Internet Explorer’s latest versions to say if the same is true of them.

Best of luck,

Ben

By: Erica Harris

Erica Harris — Wed, 12 Nov 2008 10:14:20 +0000

Thanks for this, it worked for me using Firefox 2. Will my users have to do the same to run my code from their browsers? I’m making the call from salesforce, at the moment in an scontrol, to push XML API requests to another hosted system’s server and get responses from it.

By: Chris Mumford

Chris Mumford — Tue, 01 Jul 2008 21:12:12 +0000

I just noticed this comment in the Firefox 3.0 release notes, “Support for Cross-Site XmlHttpRequest has been removed until the specification becomes more stable and the security model is improved (bug 424923)”.

By: Al Feersum

Al Feersum — Mon, 16 Jun 2008 13:33:30 +0000

Can’t get it to work in FF 2.0.0.14 - although prefs.js updated, can’t see the entries in about:config.

By: Chris Mumford

Chris Mumford — Wed, 04 Jun 2008 18:41:37 +0000

Thanks for the info. This works in Firefox 2.X and also in 3.0b5. However, when I upgraded to Firefox 3.0 RC1 it no longer works nor can I find a solution as of yet.

By: ramseyramos.net » Blog Archive » uncaught exception: Permission denied to call method XMLHttpRequest.open

Wed, 28 May 2008 14:25:07 +0000

[...] Latest browser will not allow to do this job. If it is a cross domain issue then the only solution are change the configurations of your Mozilla/Firefox or avoid the approach you are going on and [...]

By: XMLHttpRequest permission denied fix - Salesforce.com Ajax Toolkit « Mac OS X Leopard & Tiger Dual Boot

Tue, 29 Jan 2008 14:28:43 +0000

[...] January 21, 2008 at 11:56 pm (fixes, instructions) (Mozilla Hidden preferences, permission denied, XMLHttpRequest) Update: This post has been superseded by How to Fix Ajax Error: permission denied to call method XMLHttpRequest.open. [...]