Only on Firefox “Loading failed for the [removed] with source”

Question

I want to integrate Marketo form with my existing website on yii framework. My code works on all the browsers except Firefox.

Excerpt from my code:

Answer 1

I ran in the same situation and the script was correctly loading in safe mode. However, disabling all the Add-ons and other Firefox security features didn't help. One thing I tried, and this was the solution in my case, was to temporary disable the cache from the developer window for this particular request. After I saw this was the cause, I wiped out the cache for that site and everything started word normally.

Answer 2

I just had the same issue on an application that is loading a script with a relative path.

It appeared the script was simply blocked by Adblock Plus.

Try to disable your ad/script blocker (Adblock, uBlock Origin, Privacy Badger…) or relocate the script such that it does not match your ad blocker's rules.

If you don't have such a plugin installed, try to reproduce the issue while running Firefox in safe mode.

• If you cannot reproduce it in safe mode, it means your issue is linked to one of your plugins or settings.
• Otherwise, it might be a different issue. Make sure you have the same error message as in the question. Also look at the network tab of the developer tools to check if your script is listed (reload the page first if needed).

Answer 3

VPNs can sometimes cause this error as well, if they provide some type of auto-blocking. Disabling the VPN worked for my case.

Answer 4

I noticed that in Firefox this can happen when requests are aborted (switching page or quickly refreshing page), but it is hard to reproduce the error even if I try to.

Other possible reasons: cert related issues and this one talks about blockers (as other answers stated).

Answer 5

I've just had the same issue - for me Privacy Badger on Firefox was the issue - not adblocker. Posting for posterity

Answer 6

If the src is https and the certificate has expired -- and even if you've made an exception -- firefox will still display this error message, and you can see the exact reason why if you look at the request under the network tab.