Runing Javascript In Local HTML Files In Firefox

Question

How do I get Firefox to run active content such as JavaScript locally? Once upon a time I could find a setting in the about:config but the new versions don't seem to have the same feature, or if it's there I don't know what it is. The closest thing I could find is to setup a local testing environment. I don't want that option.

All users should be able to open the website from a local source and have it work. It works fine in other browsers so long as something equivalent to MSIE's "Allow active content to run in files on My Computer" is selected in the relevant browser options. Where is this option in Firefox? Does it even have it anymore? Been searching all over the place for an answer. This is my last resort before dumping Firefox as an option for local testing.

Answer 1

I was confused following the above answers - it seems the privacy.file_unique_origin option is now security.fileuri.strict_origin_policy.

Answer 2

Enable JavaScript in local files:

1. In Firefox, open up a new tab. Type or paste about:config in the address bar and press Enter.
2. A button appears asking if you accept the risk to change advanced settings. Click that you accept the risk.
3. Type unique in the search box, which will filter the list for words containing this word.
4. Double click the privacy.file_unique_origin preference to switch the value from true to false

Answer 3

Open about:config and set privacy.file_unique_origin to false

Answer 4

There is a flag which is checked when loading data from file://. If true, then those files are not going to be trusted. For JavaScript, this means the script is ignored.

plugins.http_https_only

From the about:config, search for that flag and make sure it's false.

Note that once done with your development, you may want to restore that flag value because otherwise a website could execute code on your computer. This flag is true by default for fairly obvious security reasons.