尝试从 Internet 下载文件时，Firefox可能会显示错误消息File could not be saved because of the source file could not be read^{(File could not be saved because the source file could not be read)}。在“File”中，会提到文件的路径——例如appdata\local\temp。它还可以要求您稍后再试或联系服务器管理员。如果您甚至在Firefox Quantum中也遇到此问题，那么您需要执行以下操作来解决此问题。

无法保存文件，因为无法读取源文件

1]验证您的互联网连接^{(1] Verify your internet connection)}

此问题的主要原因是互联网连接不稳定或您的计算机与源服务器之间的连接。每当您单击“下载”按钮从 Internet 下载某些内容时，您的 PC 就会与源服务器连接，如果由于 Internet 连接中断而在两者之间发生任何事情，您就会遇到问题。因此，请检查您的Internet连接是否有问题。

2] 使用 about:config^{(2] Use about:config)}

Firefox带有一个内置的配置选项卡，您可以在其中启用或禁用某些功能。要打开它，请在URL栏中输入关于^(about):config的内容。您将收到一条警告消息，您需要点击我接受风险^{(I accept the risk )}按钮。接下来，在搜索框中搜索enco。您将看到名为network.http.accept-encoding的设置。双击它并删除框中提到的所有值。

3] 检查 Places.sqlite 是否设置为只读^{(3] Check if Places.sqlite is set to Read Only)}

Places.sqlite是一个不应设置为只读^(Read)的文件。如果是这样，您可能会在Firefox中收到此下载错误。

在 URL 栏中输入此命令about:support。您将在配置文件文件夹^{(Profile Folder)}项目旁边看到一个打开文件夹^{(Open Folder)}按钮。

单击^(Click)它以打开Firefox配置文件文件夹。或者，您可以在文件^(File)资源管理器中输入此路径 -

C:\Users\user_name\AppData\Roaming\Mozilla\Firefox\Profiles\

在此路径中，C 是系统驱动器。另外，不要忘记将user_name替换为实际用户名。在Profiles文件夹中，您应该找到您正在使用的Firefox配置文件。^(Firefox)在该文件夹中，找到Places.sqlite文件，右键单击它，然后选择Properties。现在，检查只读^{(Read Only)}选项是否被选中。如果是，请将其删除并尝试从 Internet 下载文件。

4]删除Compreg.dat文件^{(4] Delete Compreg.dat file)}

每当您安装任何Mozilla产品（例如Firefox、Thunderbird等）时，都会自动创建Compreg.dat。如果此文件以任何方式损坏，您可能会在浏览器中遇到各种问题。

在 URL 栏中输入about:support，然后单击配置文件文件夹^{(Profile Folder)}项目旁边可见的打开文件夹^{(Open Folder )}按钮。在配置文件文件夹中，您将找到Compreg.dat文件。关闭浏览器，然后删除此文件。

5]尝试安全模式^{(5] Try Safe Mode)}

如果您在安全模式下打开 Firefox^{(open Firefox in Safe Mode)}，所有加载项都将被禁用，并且会使用最低设置。这样，您可以检查问题是否由于附加组件而发生。

在 URL 栏中输入about:support，然后单击Restart with Add-ons Disabled按钮。如果您可以在安全模式下^{(Safe Mode)}下载相同的文件，则需要找出有问题的插件。

6]刷新火狐^{(6] Refresh Firefox)}

如果上述解决方案根本不起作用，则需要刷新浏览器。您需要单击about:support页面上的Refresh Firefox按钮。

让我们知道这里是否对您有所帮助。^{(Let us know if anything here helped you.)}

File could not be saved because the source file could not be read

While trying to download a file from the internet, Firefox may display an error message File could not be saved because the source file could not be read. In of  ‘File’, the path of the file will be mentioned – like appdata\local\temp for instance. It can also ask you to try again later or contact the server administrator. If you face this issue even in Firefox Quantum, here is what you need to do to fix the problem.

File could not be saved because the source file could not be read

1] Verify your internet connection

The main cause of this problem is an unstable internet connection or the connection between your computer the source server. Whenever you click the “Download” button to download something from the internet, your PC connects with the source server, and if anything happens in between due to a broken internet connection, you will get the problem. So check that your Internet connection is not at fault.

2] Use about:config

Firefox comes with an inbuilt configuration tab, where you can enable or disable certain functionalities. To open it, enter this in the URL bar about:config. You will get a warning message where you need to click on I accept the risk button. Next, search for enco in the search box. You will see s setting called network.http.accept-encoding. Double-click on it and delete all the values mentioned in the box.

3] Check if Places.sqlite is set to Read Only

Places.sqlite is a file that should not be set to Read Only. If so, you might get this download error in Firefox.

Enter this command in the URL bar about:support. You will see an Open Folder button next to Profile Folder item.

Click on it to open the Firefox profile folder. Alternatively, you can enter this path in the File Explorer-

C:\Users\user_name\AppData\Roaming\Mozilla\Firefox\Profiles\

In this path, C is the system drive. Also, don’t forget to replace user_name with actual username. In the Profiles folder, you should find your Firefox profile that you are using. In that folder, find out Places.sqlite file, right-click on it, and select Properties. Now, check whether the Read Only option is checked or not. If yes, remove it and try to download the file from the internet.

4] Delete Compreg.dat file

Whenever you install any Mozilla product such as Firefox, Thunderbird, etc. Compreg.dat gets created automatically. If this file gets corrupted in any way, you may face various issues in the browser.

Enter about:support in the URL bar and click on the Open Folder button visible next to Profile Folder item. In the profile folder, you will find the Compreg.dat file. Close the browser and then delete this file.

5] Try Safe Mode

If you open Firefox in Safe Mode, all the add-ons will be disabled, and it will use minimum settings. In that way, you can check whether the problem is occurring due to an add-on or not.

Enter about:support in the URL bar and click on the Restart with Add-ons Disabled button. If you can download the same file in Safe Mode, you need to find out the offending add-on.

6] Refresh Firefox

If the above-mentioned solutions are not working at all, you need to refresh your browser. You need to click on Refresh Firefox button on about:support page.

Let us know if anything here helped you.

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