GoKawiilFix found for Firefox's broken resumable large-file downloads
A user investigating unstable large downloads in Firefox found that the browser's default network.http.response.timeout setting of 300 seconds, present since Firefox 28, interferes with resuming interrupted downloads. Setting that value to 0 (or a very large number) via about:config reportedly makes large downloads both resumable and more stable, though the fix only works if the server itself supports resumable downloads.
GoKawiil's interpretation of the reporting above, not reported fact.
The report suggests Firefox's resume mechanism relies on connection timeouts rather than properly reading the partially-downloaded .part files, which could explain long-standing complaints about failed large downloads dating back to 2005. Because this is based on experimental observation rather than a confirmed look at Firefox's source code, the exact cause remains unverified, and users may still need workarounds like wget for reliable large downloads.
- Firefox's default 300-second response timeout appears to break resumable large downloads.
- Setting network.http.response.timeout to 0 in about:config reportedly restores resumability and stability.
- The fix only helps if the download server itself supports resuming; the underlying Firefox behavior remains unconfirmed via source code.
Source: lunarwatcher.codeberg.page, 2026-10-12
Published there as: “Making big downloads resumable in Firefox”
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