Websites that involve JavaScript will load but an error message will pop up and soemtimes the website may not even load at all. How do I resolve this issue?
When first loading a variety of different pages (USPS.com for instance) that utilize java, I get an error message: "[JavaScript Application] Error: The operation is insecure." This is not happening in any other browsers installed on my computer and this only started happening roughly a week ago. It is becoming a bit annoying and prohibits me from being able to register some software due to the JavaScript errors that are occuring.
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To avoid confusion:
If you use extensions (Firefox/Tools > Add-ons > Extensions) that can block content (e.g. Adblock Plus, NoScript, Flash Block, Ghostery) then make sure that such extensions aren't blocking content.
Note that your System Details List shows that you have a user.js file in the profile folder to initialize some prefs on each start of Firefox.
The user.js file is only present if you or other software has created it, so normally it wouldn't be there. you can check its content with a plain text editor if you didn't create this file yourself.
The user.js file is read each time you start Firefox and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.
You can delete the user.js file and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js
Note that you currently have enabled caret browsing: accessibility.browsewithcaret: True
- Tools > Options > Advanced > General > Accessibility: [ ] "Always use the cursor keys to navigate within pages"