How to enable CORS on Firefox

Question

Can somebody please tell me how I allow CORS on firefox  I easily managed it on Chrome and IE  but I am totally failing at it with Firefox  I edited the following about config entry    security fileuri strict origin policy   false   This attempt has been posted several times here and is told on other sites too  but it has no effect  I read the Mozilla guide to Same-origin-policies   https   developer mozilla org en-US docs Web HTTP Access control CORS  but it just explains CORS and the related topics  A workaround to enable it on FF is not listed    I would really appreciate a definitive solution    ps  FORCECORS does not work either somehow

User · Answer

I was stucked with this problem for a long time (CORS does not work in FF, but works in Chrome and others). No advice could help. Finally, i found that my local dev subdomain (like sub.example.dev) was not explicitly mentioned in /etc/hosts, thus FF just is not able to find it and shows confusing error message 'Aborted...' in dev tools panel.

Putting the exact subdomain into my local /etc/hosts fixed the problem. /etc/hosts is just a plain-text file in unix systems, so you can open it under the root user and put your subdomain in front of '127.0.0.1' ip address.

User · Answer

It s only possible when the server sends this header   Access-Control-Allow-Origin     If this is your code then you can setup it like this  PHP    header  Access-Control-Allow-Origin

User · Answer

Very often you have no option to setup the sending server so what I did I changed the XMLHttpRequest open call in my javascript to a local get-file php file where I have the following code in it    x000D   x000D   lt  php x000D     file   file   GET  url     x000D    echo implode      file   x000D    gt  x000D   x000D   x000D    javascript is doing this    x000D   x000D  var xhttp   new XMLHttpRequest    x000D  xhttp onreadystatechange   function     x000D    if  this readyState    4  amp  amp  this status    200    x000D         File content is now in the this responseText x000D      x000D     x000D  xhttp open  GET    get-file php url http   site file   true   x000D  xhttp send    x000D   x000D   x000D    In my case this solved the restriction situation just perfectly  No need to hack Firefox or servers  Just load your javascript html file with that small php file into the server and you re done

User · Answer

This Firefox add-on may work for you    https   addons mozilla org en-US firefox addon cors-everywhere   It can toggle CORS on and off for development purposes

User · Answer

just type in your browser CORS add in firefox Then download this and install on browser finally you found top right side one Core spell to toggle that green for enable and red for not enable

User · Answer

Do nothing to the browser  CORS is supported by default on all modern browsers  and since Firefox 3 5    The server being accessed by JavaScript has to give the site hosting the HTML document in which the JS is running permission via CORS HTTP response headers     security fileuri strict origin policy is used to give JS in local HTML documents access to your entire hard disk  Don t set it to false as it makes you vulnerable to attacks from downloaded HTML documents  including email attachments

[firefox] How to enable CORS on Firefox?

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