easiest way to "roll back" to firefox version 21?

[John Reynolds]

Hi all,

Is there an "easy" way to install the port/package for Firefox version 
21? I'm trying to install version 22 out of a fresh ports tree and 
having nothing but trouble with it.

1) The "Show All Bookmarks" feature that brings up another dialog 
allowing you to manipulate current bookmarks is not working at all. In a 
virgin install (new profile, in a "tmp" account with no prior dotfiles, 
nothing) this window comes up as empty--just three panes but no 
"History/Downloads/Tags/All Bookmarks", etc. in the left column, 
nothing. It will also not "import" bookmarks from a known good JSON file.

2) I keep having the "back arrow" not work. I'll click a link in a page 
and then the back arrow is still grayed out like it's the first page in 
a tab. Right click to get the context menu also shows "Back" as grayed 
out and not available.

First off is anybody else seeing these two behaviors with FF 22? 
Secondly, how can I "roll back" to build FF 21?

thx

-Jr