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An independent report describes experimental tests in which setting Firefox’s network.http.response.timeout preference to 0 or a very large value appeared to improve the stability and resumption of large downloads. The author has not verified the explanation in Firefox’s source code, and the setting cannot make a download resumable if the server does not support it.
An independent report says changing Firefox’s network.http.response.timeout preference may help some large downloads resume after an error, based on the author’s experimental testing. The suggested change is to set the preference to 0 or a very large value, but it is not an officially verified Firefox fix, and it only applies when the download server supports resuming.
The report, published on lunarwatcher.codeberg.page, says the preference in Firefox 28 and later is set to 300 seconds. The author reports that increasing the value or setting it to zero seemed to make large downloads more stable and more likely to continue after an interruption. The report does not give a test dataset, download sizes, server details, or a measured success rate.
The author’s proposed explanation is tentative. They suspect Firefox’s handling of resumable downloads may depend on connection timeouts and that a timeout can interfere with retry attempts. They also observed Firefox apparently ignoring an existing .part file in some circumstances. The report explicitly says the author did not inspect Firefox’s source code and does not know precisely why the preference appeared to help.
The advice has a firm limitation: the server must support resumable downloads. A browser preference cannot make a server provide the data needed to continue an interrupted transfer. The author also mentions wget’s continuation option as a non-Firefox alternative they found more stable, but that observation is not a controlled comparison.
Fewer Restarts for Large Transfers
When a large download fails near completion, restarting from the beginning can waste time and bandwidth. If the report’s workaround applies to a user’s setup, changing the timeout preference could reduce that disruption by helping Firefox recover from some interruptions rather than abandoning the transfer.
The finding is most relevant to people downloading large files over slow or inconsistent connections, but it should be treated as a user-reported workaround, not a general solution. Results may depend on the server, network, and Firefox version. The lack of documented tests means readers cannot tell how often the change works or whether it carries trade-offs for other network activity.
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A Timeout Setting With Unclear Effects
The report identifies network.http.response.timeout as a Firefox preference available through the browser’s advanced configuration page, about:config. It says Firefox 28 and newer use a value of 300 seconds. The source does not provide a Mozilla statement, a support document, or a bug report confirming that this default causes resumable-download failures.
The author describes Firefox’s resumable-download behavior as unstable and says the issue has appeared in some form since 2005. That is the author’s characterization; the report does not cite a specific historical bug or establish that the same technical cause has persisted across versions. It also mentions a manual process involving .part files but declines to describe or use it. These details point to longstanding user frustration, not a confirmed account of Firefox’s internal implementation.
“Setting network.http.response.timeout to 0 (or something very big) in about:config seems to make big downloads both resumable and at least a little more stable.”
— The report’s author
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The Cause Has Not Been Verified
The report does not establish that the 300-second preference causes Firefox’s download-resumption problems, or that changing it will help across current versions. There are no disclosed test conditions, version numbers beyond the broad reference to Firefox 28 and newer, reproducible steps, or independent results. The author’s explanation about timeouts, retries, and .part files remains a hypothesis.
It is also unknown whether a zero value has any unintended effects on other requests, how Firefox interprets that value in every version, or how much improvement users should expect. The report does not say which servers or file-hosting systems were tested. Users should not assume that an interrupted transfer can be recovered unless the server supports the necessary resume behavior.
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Independent Tests Are Still Needed
The next useful step would be reproducible testing across current Firefox versions, different servers, and interrupted transfers, with results documenting the preference value and whether the download resumes from its previous position. Confirmation from Mozilla documentation or a relevant Firefox bug report could also clarify the setting’s intended behavior and any possible trade-offs.
Until that evidence is available, the timeout change remains an informal workaround reported by one author. Readers considering it should understand that it may not work for every download, and that server-side support remains necessary. The report does not announce a Mozilla change, scheduled fix, or official response.
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Key Questions
What Firefox setting does the report recommend changing?
It recommends changing network.http.response.timeout in about:config to 0 or a very large value. The reported benefit comes from informal testing and is not an officially confirmed fix.
Will this make every download resumable?
No. The report says the server must support resumable downloads. A browser setting cannot add resume support to a server that does not provide it.
Why might changing the timeout help?
The author suspects a timeout may disrupt Firefox’s retry or resume behavior. They did not verify that explanation in Firefox’s source code, so the reason remains uncertain.
Has Mozilla confirmed this workaround?
The source report provides no Mozilla confirmation, official documentation, or Firefox bug response. It should be treated as an individual experimental observation.
What alternative does the report mention?
The author says wget with its continuation option worked for them as a non-Firefox alternative. The report does not provide a controlled comparison or guarantee that it will work with every server.
Source: hn
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