Uzbl sounds like you'll be able to do neat things: (haven't looked at it, but here's my imagination:) log your clickstream to STDOUT, filter URLs clicked on with a shell script (ad-block implemented in perl regexes), re-implement greasemonkey with "perl -pe 's/foo/bar/g'", etc.
As an aside: I can't use the web without Mozilla's keywords: "g foo" does a google search for foo, "w foo" does a wikipedia search, "imdb foo" does an IMDB lookup, "to foo" uses google maps to tell me how far a way a city is, etc.)
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