Firefox 27.0.1 on a Mac OS 10.9.2 the button to enable javascript is missing

I am having a problem with the BBC iPlayer playing in a separate pop-out player. Their support people have asked me to check that javascript running is enabled.
In the Preferences content tab there is no button to enable Javascript, in fact the Preference screen looks nothing like the picture on the support sites.
I have found that other preference items have moved in Mavericks after I upgraded and I would be pleased if you could tell me how to get Firefox working properly again. FYI I have no problem with the pop-out issue with Chrome or Safari

To avoid confusion:
*http://kb.mozillazine.org/JavaScript_is_not_Java
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.
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
You can inspect and manage the permissions for the domain in the currently selected tab via these steps:
*Click the "[[Site Identity Button|Site Identity Button]]" (globe/padlock) on the location bar
*Click "More Information" to open "Tools > Page Info" with the Security tab selected
*Go to the Permissions tab (Tools > Page Info > Permissions) to check the permissions for the domain in the currently selected tab
You can inspect and manage the permissions for all domains on the <b>about:permissions</b> page.
*https://support.mozilla.org/kb/how-do-i-manage-website-permissions

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