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I know you can queue up all the downloads in firefox and if you keep adding them, they just keep downloading. I know I can pause a download and let one finish and then start the other one. But is there a way, maybe an entry in about:config that can help me limit how many downloads to allow going on. I know I can use a download manager but I'm just curious about this. I am not asking for a bandwidth limit tip but instead a download number limit tip. Thanks.

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Why would you want to limit the number of downloads in the first place? – Randell Aug 19 '09 at 1:58
So you can start accessing / using individual files earlier, instead of all of them later? – KTC Aug 19 '09 at 3:21

Try finding network.http.max-connections-per-server in about:config and reducing the value.

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There are two limits in Firefox (and all XulRunner apps) - Maximum number of connections overall, and max connections per server.

see network.http.max-connections and network.http.max-connections-per-server in about:config

(Adding to Damian's answer; will vote his up once I have some rep...)

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I'd use a download manager - something like download them all - this will give you the control you're after, and a bunch more.

Limiting your max-connections will do the job, but if I understand correctly will also limit how many files you can download when browsing and slow down web-pages (probably not the effect you're after).

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