Script to select DA as default browser

As DA does not yet have form fill and adblock-like ad blocking, is there a way to easily (via script or command line – i.e. via quicksilver) switch between default browsers?

This way one could quickly switch the default browser based on one’s task at hand – without needing to open Safari oder SystemPrefs (with RCDefaultApp)?

I’m not sure if that’s what you’re looking for but this script opens the frontmost page of DEVONagent in Safari and might be useful:

tell application "DEVONagent"
	if exists browser 1 then
		set theURL to URL of browser 1
		tell application "Safari"
			set this_doc to make new document at the beginning of documents
			set the URL of this_doc to theURL
		end tell
	end if
end tell

Not really, I was looking for a script to actually set the default browser from DA to Firefox and back.

1Password adds form and password fill capability to DA very nicely.