I haven't seen this behaviour since I reported it.
But to answer your other questions:
Flash: 'Edit > Preferences > Content > Manage...' SPL: Open with Shockwave Flash
Java: I have both Blackdown and Sun Java installed. I can't find a way to see which one Firefox is using.
Extensions: * Adblock Plus * FireFTP * Web Developer
I haven't seen this behaviour since I reported it.
But to answer your other questions:
Flash:
'Edit > Preferences > Content > Manage...'
SPL: Open with Shockwave Flash
Java:
I have both Blackdown and Sun Java installed. I can't find a way to see which one Firefox is using.
Extensions:
* Adblock Plus
* FireFTP
* Web Developer