Mozilla has officially released Firefox 3.0.6. It is a regular security and stability update to Firefox 3.0.x. Firefox 3.0.6 fixes several issues found in the previous Firefox 3.0.5. As usual this update will make you safer on the web.
What’s New in Firefox 3.0.6 ?
+ Fixed several security issues.
+ Fixed several stability issues.
+ In previous versions of Firefox, some users experienced a problem where parts of the screen were not properly displaying after Firefox was open for long periods of time.
+ Improved the ability for scripted commands (including those included in popular extensions like Adblock Plus) to work properly with plugins. (bug 438830)
+ Removed the client user ID from crash reports.
+ Fixed issues with the display of some Indic scripts.
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Hi! Welcome to 
Sine I upgraded to 3.0.5 My download speed had been dramatically reduce to a ridiculos slow download speed on broadband. Is there anyway I can tweak it?
I found 3.0.6 quite stabile & realible.