I just had a play about with Proxomitron and, after setting it up and making some adjustments to the config file, it does indeed appear to block the movies from loading. It replaces the movie with the word 'flash'. Clicking on 'flash' will subsequently load the movie if you want. I used it with the latest version of Firebox but I know that it works well with IE too. The file I downloaded from the website was 'ProxN45j.exe'.
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