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A report on the personal site lunarwatcher describes experiments in which changing Firefox’s network.http.response.timeout preference appeared to make some large downloads more resumable and stable. The author has not confirmed the mechanism in Firefox’s source code, and the workaround depends on the download server supporting resumption.
A user report says changing Firefox’s network.http.response.timeout preference may help large downloads resume after an error, but the author describes the result as experimental and has not verified how the browser handles the change. The workaround cannot make a download resumable unless the server supports resuming it.
The report, published on lunarwatcher.codeberg.page under the title “Making big downloads resumable in Firefox,” says Firefox 28 and later have used a default value of 300 seconds for the network response timeout. The author reports that setting the preference to 0 or a much larger value appeared to improve the stability of large downloads and allow Firefox to resume some downloads after errors.
The author says the tests were informal and that the behavior was not checked against Firefox’s source code. The report offers a possible explanation: the timeout may affect Firefox’s attempts to retry a failed connection. It also speculates that Firefox’s resume behavior may rely on connection timeouts rather than simply continuing from a partially downloaded .part file. These are hypotheses, not confirmed descriptions of Firefox’s implementation.
The report makes clear that this change has limits. A server must support resumable downloads for a browser to continue from the point of interruption. If it does not, changing a Firefox preference—or switching to another browser—will not provide that capability. The author also says Firefox’s resume behavior has seemed unreliable in their experience, and mentions wget -c as a separate command-line alternative that worked in their tests.
A Possible Fix for Interrupted Transfers
Large downloads can take long enough that a network interruption or server delay forces users to start over, wasting time and bandwidth. If the report’s observation applies to a reader’s setup, changing the timeout preference could be a useful troubleshooting step when Firefox fails to continue a download that the server can resume.
But the report is not a controlled test or an official Mozilla recommendation. It gives no test matrix, download sizes, server details, Firefox build numbers beyond the historical preference statement, or measured success rates. Readers should treat the setting as an individual workaround to test cautiously, not a demonstrated fix for Firefox downloads generally. The report does not establish whether the change affects other network requests or what trade-offs may follow from allowing a response to wait longer.
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How Timeout and Resume Interact
The report identifies Firefox’s about:config page as the place to change the preference. It says the default response-timeout value has been 300 seconds in Firefox 28 and newer, but supplies no Mozilla documentation or source-code citation to corroborate that history. Its account should therefore be understood as the author’s description of the setting, rather than an independently verified explanation of Firefox’s defaults.
Resuming a download depends on both the browser and the server. The server must support continuing a transfer, while the browser must correctly recover after a connection fails. The report’s central observation is that a timeout change seemed to affect that recovery in Firefox. The author says they did not investigate the code and is unsure whether existing partial files are ignored or how Firefox’s retry behavior relates to the preference.
The author also refers to a manual procedure involving a .part file, but does not explain it in detail and says they chose not to use it. That omission leaves the report focused on the preference experiment, rather than providing a tested step-by-step account of Firefox’s download-resume internals.
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The Browser Mechanism Is Unverified
The report does not establish why the timeout change appeared to help, whether it works consistently, or which current Firefox versions and operating systems are affected. It provides no controlled comparison between the default value and the proposed alternatives, and does not say how many downloads were tested or what servers were involved.
It is also unclear whether a value of zero disables the timeout in all relevant Firefox versions, or whether the preference’s behavior has changed since the report was written. The report gives no date, and its claims about Firefox 28 and later are not accompanied by documentation. No official Mozilla response or confirmation is included in the supplied source material.
Most importantly, the author’s theory about retries and .part files remains speculation. The source does not establish that Firefox ignores partial files in every case, nor that the setting is safe or suitable as a general recommendation. Any result will depend in part on the server’s support for resuming and the user’s specific download conditions.
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Test Carefully on Your Own Setup
The report offers no scheduled follow-up, Mozilla investigation, or planned release change. For users considering the setting, the next practical step is to check whether the download host supports resuming and consult current Firefox documentation before changing advanced preferences. The report itself does not provide official instructions or guidance on restoring the default value.
Further confirmation would require repeatable tests across current Firefox versions, different servers, and interrupted transfers, along with a review of Firefox’s source code or documentation. Until that evidence is available, the preference change remains a user-reported experiment, not a verified Firefox fix. The source’s alternative, wget with its continuation option, is also described only from the author’s experience and is not a universal guarantee.
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Key Questions
What Firefox setting does the report recommend changing?
The report says to change network.http.response.timeout in Firefox’s about:config page to 0 or a much larger value. It presents this as an experimental workaround, not official Mozilla guidance.
Will the setting make every download resumable?
No. The report says the server must support resuming the transfer. A browser preference cannot add resume support to a server that does not provide it.
Why might changing the timeout help?
The author suspects it may affect Firefox’s retry behavior after a connection problem, but says the explanation has not been verified against Firefox’s source code. The mechanism remains unclear.
Has Mozilla confirmed this workaround?
The supplied report contains no Mozilla confirmation, and it does not cite official documentation. Its finding is based on the author’s informal testing.
What alternative does the report mention?
The author says wget -c worked as a command-line option for continuing downloads in their tests. That observation is personal experience, not a guarantee for every server or transfer.
Source: hn
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