Not sure how often
Additional System Details
- -Shockwave Flash 10.0 r22
- The Totem 2.24.2 plugin handles video and audio streams.
- DivX Web Player version 188.8.131.52
- The default plugin handles plugin data for mimetypes and extensions that are not specified and facilitates downloading of new plugins.
- The demo print plugin for unix.
- Java(TM) Plug-in 1.6.0_10
- User Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:184.108.40.206) Gecko/2008101315 Ubuntu/8.10 (intrepid) Firefox/3.0.3
Although possibly not related to your problem, I will remind you that the version of Firefox you are using at the moment has been discontinued and is no longer supported. Furthermore, it has known bugs and security problems. I urge you to update to the latest version of Firefox, for maximum stability, performance, security and usability. You can get it for free, as always, at getfirefox.com.
As for your issue, hopefully this support article is what you need: