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An independent technical report says setting Firefox’s network.http.response.timeout preference to 0 or a much longer value appeared to make some large downloads more stable and resumable in the author’s tests. The author has not confirmed the cause in Firefox’s source code, and the workaround depends on the server supporting resumed downloads.
An independent report says changing the network.http.response.timeout preference in Firefox may help some large downloads resume after an error, addressing a problem the author encountered with downloads that the server could resume. The proposed change is experimental, not a confirmed Mozilla fix: the author says testing suggested an improvement but did not establish why it works or verify the behavior against Firefox’s source code.
The report says Firefox 28 and later versions have used a default value of 300 seconds for the network.http.response.timeout preference. Its author recommends setting the preference to 0 or a much longer interval through Firefox’s about:config interface, reporting that this appeared to improve both resumability and stability in their tests. The report does not provide a formal test protocol, controlled comparisons, or results across Firefox versions and operating systems.
The suggested adjustment cannot make an unsupported download resumable. The author stresses that the server must support resuming; if it does not, changing a browser preference will not provide that capability. The report concerns a narrower failure: Firefox allegedly not resuming a download after an error even when the server can provide the remaining data.
The author says Firefox may ignore an existing .part file under the default preference and speculates that its retry behavior may be affected by the response timeout. Those explanations are explicitly uncertain. The report offers no confirmation from Mozilla and does not establish that the setting will improve downloads for other users.
A Possible Fix for Interrupted Downloads
Large downloads can take long enough that a connection interruption or timeout forces users to start again, wasting time and bandwidth. If the report’s workaround applies to a user’s setup, changing the preference could help Firefox continue a download after an error rather than abandoning it. That would be particularly relevant where files are large and connections are inconsistent.
The practical value remains limited by the evidence: this is an individual report, not a documented browser update or a Mozilla-supported recommendation. Users should treat the setting as a workaround to test cautiously, not as a guaranteed repair. The server’s behavior, the particular download, and Firefox’s handling of errors may all affect the outcome.
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Firefox’s Timeout and Download Behavior
The report traces its observation to a preference that it says has a 300-second default in Firefox 28 and newer. It characterizes that value as interfering with large downloads, but does not provide a Mozilla explanation for the preference or show that the timeout is responsible in every case.
It also describes resumable downloads as a longstanding area of difficulty, saying problems have appeared in some form since 2005. The report does not cite a specific bug record or document that history in detail. As an alternative outside Firefox, the author says the command-line tool wget, used with its continue option, worked more reliably in their experience. That is an anecdotal comparison, not a controlled test against Firefox.
“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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What the Tests Do Not Establish
The report does not say when its tests were conducted, identify the exact Firefox version tested, or give enough detail to reproduce the results. It does not establish whether setting the preference to 0 disables the timeout, how Firefox interprets that value in this case, or whether a large finite value behaves differently. The author’s own account says the mechanism is not understood.
It is also unclear how often the issue occurs, whether it affects particular servers or network conditions, and whether the behavior has changed in later Firefox releases. The report includes no response from Mozilla, no source-code analysis, and no independently replicated results. Its suggestion that Firefox relies on connection timeouts rather than saved partial files is explicitly speculative.
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Further Verification Is Needed
The immediate next step for establishing the claim would be repeatable testing across Firefox versions, servers that support range requests or other resume mechanisms, and different interruption scenarios. Source-code review or a response from Mozilla could help determine whether the timeout preference is connected to the reported behavior. The source material does not say that either is planned.
For readers considering the change, the report supports only a cautious experiment on a download that can be restarted if needed; it does not provide a universal fix or guarantee. Whether the setting helps will depend in part on server support, and the underlying cause remains unresolved in the account provided.
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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 much longer value. The author describes this as an experimental workaround, not a confirmed Mozilla recommendation.
Will the change make every download resumable?
No. The report says the server must support resumable downloads. A browser preference cannot add resume support to a server that does not provide it.
Why might changing the timeout help?
The author suspects the timeout may affect Firefox’s retries or resume behavior, but says the mechanism is not understood and was not checked against Firefox’s source code.
Has Mozilla confirmed this workaround?
The source report contains no Mozilla confirmation, and it does not cite a formal Firefox fix or a controlled, independently replicated test.
Source: hn
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