The plan was for Firefox 4 Beta 8 to be released at the end of November. Here we are the 3rd of December and no Beta 8. The latest release post from Mozilla shows Beta 8 as ‘December’ with Beta 9 and 10 along with RC1 as ‘TBD’. However, it appears the next updates for Firefox 3.6 and 3.5 (which Mozilla still says updates would be provided through August 2010) are still on schedule for December 9th. Also looks like there is going to be a Thunderbird update coming out on December 9th as well.
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Old Versions of Firefox
Download Old Versions of FirefoxFirefox Releases
Current- 3.6.22 - September 6th
- 6.0.2 - September 6th
- 6.0.1 Mobile - August 30th
- 7.0 Beta 1 - August 18th
- 8.0 Aurora - August 19th
Upcoming
- 3.6.23 - September 27th
- 7.0 Final - September 27th
- 8.0 Beta - September 27th*
- 9.0 Aurora - September 27th*
* Dates for Aurora and Beta builds are for the code merge. Actual release date is around 1-7 days after the merge. More Info- 3.6.22 - September 6th
Firefox Developmental Channels
- Nightly -- Firefox 9
- Aurora -- Firefox 8
- Beta -- Firefox 7
- Release -- Firefox 6.0
Get Developmental Builds - Nightly -- Firefox 9

I’ve heard beta 8 is going to come on Dec 7/8 along with a Fennec beta…
Yes, it is ‘tied to’ Fennec Beta 3 which is tied to Firefox 4 Beta 8.