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I have a good reason to want to disable caching by default in my browser.

(It's a particular approach to privacy whereby for sites I don't visit that often or log into, disabling cache prevents them from knowing whether I have visited their site at any time before, or another one that has cross-site objects loading, either.)

However, I've come to see that sometimes, it's more in my privacy interests to have any cross-site objects that I use a lot, to be SAVED in cache, so that after the first download so I am not re-pinging (to re-download) those objects every time I browse other websites referencing them, thus announcing to that third-party website every page that I'm visiting on the web when using it.

So I am in need, of a way to control what is cached, and what isn't, in Firefox.

Is there some add-on that can do essentially do rule-based 'firefox cache control', or to put it another way, a rules-based 'firefox cache blocker'?

I can find add-ons that do the opposite - custom exceptions to (the normal) 'caching allowed' by BLOCKING caching for individual sites - but not the other way - ALLOWING cache, for ONLY certain sites (or URLs) where the default is to not store cache.

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I know a good proxy server (e.g., Squid) will do this, either for one PC or for a whole network; one could set Firefox's cache at zero and depend on Squid to do the job.

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