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When the web content cache reaches 350 MB, Firefox becomes unresponsive

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When my web content cache reaches the default size (350 MB), Firefox refuses to load any new content. When I manually clear the cache from the Advanced > Network options, it's still unresponsive (no new pages will load). When I restart Firefox, it's still unresponsive. The only "fix" I've found is to reboot my PC, which seems extreme.

When my web content cache reaches the default size (350 MB), Firefox refuses to load any new content. When I manually clear the cache from the Advanced > Network options, it's still unresponsive (no new pages will load). When I restart Firefox, it's still unresponsive. The only "fix" I've found is to reboot my PC, which seems extreme.