Someone on one of the comp groups pointed me in the direction of a powerful geeks alternative to Adblock for Firefox called RequestPolicy.
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It can be set initially to block all outbound requests outside the target domain (which will break many sites) but you can easily see which requests have been blocked and add permissions to legitimate ones in a single click on a global or site by site basis.
Nice tracking of blocked content (pic taken on my recent visit to Toolstation):
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