Only on Firefox Loading failed for the script 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           button   click function          var formData              Email       UserInfo email   val             FirstName       UserInfo first name   val             LastName       UserInfo last name   val                   MktoForms2 loadForm    app-ab23 marketo com   mcId  formId  function  form            var myForm   MktoForms2 allForms   0           myForm addHiddenFields formData           myForm onSuccess function  values  followUpUrl                return false                      myForm submit                  I get error on Firefox only with message      Loading failed for the  lt script gt  with source    http   app-ab23 marketo com index php form getForm munchkinId 1111 amp form 1111 amp url http 3A 2F 2Fblox dev 2Fwizard 2Fmap amp callback jQuery110207175825035737486 1503656391790 amp   1503656391791       other browsers do the job correctly  note  munchkinId and formId are changed for posting here

User · Answer

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).

User · Answer

I had the same issue with firefox  when I searched for a solution I didn t find anything  but then I tried to load the script from a cdn  it worked properly   so I think you should try loading it from a cdn link  I mean if you are trying to load a script that you havn t created  because in my case  when tried to load a script that is mine  it worked and imported successfully  for now I don t know why  but I think there is something in the scripts from network  so just try cdn  you won t lose anything   I wish it help you

User · Answer

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

User · Answer

Today I ran into the exact same problem while working on a progressive web app  PWA  page and deleting some cache and service worker data for that page from Firefox  The dev console reported that none of the 4 Javascript files on the page would load anymore  The problem persisted in Safe mode  so it was not an add-on issue  The same script files loaded fine from other web pages on the same website  No amount of clearing the Firefox cache or wiping web page data from Firefox would help  nor would rebooting the Windows 10 PC  Chrome all the time worked fine on the problem page  In the end I did a restore of the entire Firefox profile folder from a day-old backup  and the problem was immediately gone  so it was not a problem with my PWA app  Apparently something in Firefox got corrupted

User · Answer

This could also be a simple syntax error  I had a syntax error which threw on FF but not Chrome as follows        lt script src  https   ajax googleapis com ajax libs jquery 3 4 1 jquery min js  gt          defer      lt  script gt

User · Answer

As suggested above  this could possibly be an issue with your browser extensions  Disable all of your extensions including Adblock  and then try again as the code is loading fine in my browser right now  Google Chrome - latest  so it s probably an issue on your end  Also  have you tried a different browser like shudders IE if you have it  Adblock is known to conflict with domain names with track and market in them as a blanket rule  Try using private browsing mode or safe mode

User · Answer

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

User · Answer

I had the same problem  different web app though  with the error message and it turned out to be the MIME-Type for  js files was text x-js instead of application javascript due to a duplicate entry in mime types on the server that was responsible for serving the js files  It seems that this is happening if the header X-Content-Type-Options  nosniff is set  which makes Firefox  and Chrome  block the content of the js files

User · Answer

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

User · Answer

I ran into the same issue  exact error message  and after digging for a couple of hours  I found that the content header needs to be set to application javascript instead of the application json that I had  After changing that  it now works

User · Answer

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

User · Answer

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

[javascript] Only on Firefox "Loading failed for the <script> with source"

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