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A report on the personal site lunarwatcher.codeberg.page says changing Firefox’s network.http.response.timeout preference may make large downloads more stable and help them resume after errors. The author describes this as experimental testing, not a verified explanation, and says it only applies when the download server supports resuming.
A report on lunarwatcher.codeberg.page says changing Firefox’s network.http.response.timeout preference may help some large downloads recover and resume after a connection error. The author reports that setting the value to 0 or a much larger number appeared to improve results in experiments, but says the explanation has not been checked against Firefox’s source code or confirmed by Mozilla.
The report says Firefox 28 and later has a default value of 300 seconds for the response-timeout preference. Its author suspects that reaching this timeout can interfere with Firefox’s attempts to retry a failed download or resume it, and says experiments suggested the preference was related to both download stability and retries. These are the author’s observations, not a documented diagnosis of Firefox’s download system.
The proposed change is made through Firefox’s about:config page. The report says to set the preference to zero or to a substantially longer timeout. It does not provide a controlled comparison, details of the files or servers tested, or a tested value that readers can expect to work in every case. A result on one download setup may not carry over to another.
The author stresses a key limitation: the server must support resumable downloads. A browser preference cannot make a server provide the data needed to continue a partial download. The report also says Firefox may ignore an existing .part file in some cases, but presents its theory that Firefox relies on connection timeouts rather than that file as uncertain. The author says they did not inspect Firefox’s source code to verify the mechanism.
When a Download Can Continue
For people downloading large files over unreliable connections, the difference between resuming and starting again can mean avoiding a long repeat transfer. The report points to a possible browser-side setting for users who see failures, while its caveats make clear that this is a user-tested workaround, not an established fix.
The distinction between browser and server support matters. Resuming generally depends on the server being able to serve the remaining portion of a file; changing Firefox’s timeout cannot supply that capability. Even when a server supports resuming, the report does not establish that the preference change will work across Firefox versions, websites, or network conditions. Readers should treat the suggestion as an experiment rather than a guaranteed solution.
The report also raises a narrower reliability question: what Firefox does after a stalled or interrupted response. If the timeout affects retries, that might explain why some downloads fail to continue, but the report provides no code-level confirmation or systematic test results. It therefore offers a lead for further investigation rather than evidence of a browser-wide defect.
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Firefox’s Timeout and Partial Files
The report identifies the preference as network.http.response.timeout and says its 300-second default has been present since Firefox 28, which it characterizes as applying to modern releases since around 2014. That version history and the preference’s behavior are claims in the report; the supplied material does not include Mozilla documentation or an independent verification.
Firefox download workflows can involve temporary partial files, often marked with a .part extension. The author says that seeing such a file did not reliably mean Firefox would resume it, and describes a manual way of rearranging partial files that they chose not to use. As an alternative outside Firefox, the report names wget -c, a command-line option for continuing a download, and says it appeared more stable in the author’s experience.
The author describes resumable-download problems as having been known in some form since 2005. The source does not provide a specific bug report, release history, or evidence that the old and current behaviors share the same cause, so that reference should not be read as proof of one continuous Firefox issue.
“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 Experiments Do Not Show
The report does not establish whether changing the timeout causes the improvement, how often the change works, or which Firefox releases and download servers were tested. It also does not identify a Mozilla statement or bug-tracker record confirming that the default timeout prevents resumable downloads.
The proposed link between the timeout, hidden retries, and Firefox’s handling of .part files remains a hypothesis. The author says the observations were experimental and that they did not investigate the source code. It is also unclear what value counts as “very big,” whether zero has the same effect across versions, and what trade-offs a longer timeout could have when a server stops responding.
There is no independent reproduction or detailed test method in the supplied source material. The current behavior of Firefox and the preference’s documented purpose should be checked against Mozilla’s own materials before treating the suggested change as a supported remedy.
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Verification Needed Before a Fix
The immediate next step for users considering the suggestion is to check whether the server supports resuming and compare behavior carefully on their own setup. Because the report describes a preference change rather than an officially supported resolution, readers should record the original setting and consult current Mozilla guidance before altering advanced configuration.
To establish whether this is a broader Firefox issue, the claim would need repeatable tests across versions, networks, file sizes, and servers, along with evidence about how retries and partial files are handled. A Mozilla bug report or source-code review could clarify whether the timeout is involved. The source material gives no indication that Mozilla has announced an investigation or that a browser change is planned.
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Key Questions
What Firefox setting does the report recommend changing?
It names network.http.response.timeout, which the author says can be changed in about:config. The report suggests setting it to zero or a much larger value, but does not establish a universally effective setting.
Will changing the preference make every large download resumable?
No. The report says the server must support resumable downloads. It also presents the preference change as an experimental observation, not a guaranteed fix for all downloads.
Has Mozilla confirmed that the timeout causes the problem?
The supplied report does not cite confirmation from Mozilla. Its author says they did not check Firefox’s source code, so the proposed explanation remains unverified.
What alternative does the report mention?
The author says wget -c appeared more stable in their experience. That is an observation from the report, not a comparative test establishing that it is more reliable in general.
Source: hn
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