JavaScript
JavaScript is a scripting language used to add functions to webpages, such as manipulating browser windows.
Turn JavaScript on or off
In rare cases, JavaScript may be used intrusively to perform certain actions you may find annoying. For these cases, you can turn it off completely, but note that this will often mean that some webpages will not work as designed.
To turn JavaScript off, go to and uncheck "Enable JavaScript". To turn it back on, check this option.
Alternatively, you can use and check or uncheck "Enable JavaScript".
JavaScript options
To more specifically control what JavaScript does in webpages, you can set specific options in advanced preferences. Go to and click the "JavaScript Options" button. In the resulting dialog, select what you want to allow.
Set site-specific preferences
If you want to change JavaScript settings for a particular website, you can use site preferences.
Related topics
Also see: User JavaScript tutorial