Open a File Explorer window by right-clicking the Start button and selecting File Explorer or pressing the Windows and E keys together.Turning off the Read-only function will get rid of the problem. The download error could be showing up because the file is set to Read-only and the browser can’t write new information to it. The places.sqlite file is where Firefox saves your bookmarks and keeps a record of your downloaded files.

Make sure the places.sqlite file is not set to Read-only You can now check if the error persists.Now delete everything in the box and restart the browser.Navigate to the “-encoding” setting and double-click it.Now go to the search box and type “enco.”.Once the “Proceed with caution” warning message appears, click on the “Accept risk and continue” button.Go to the address bar, type “about:config,” and then hit the Enter key.Follow these steps to adjust it and see if that will resolve the problem: The setting could be the cause of the error message if it’s misconfigured. The -encoding setting helps tell a server what encoding an HTTP client supports. Restart the browser and try downloading the file.Īdjust the “-encoding” setting.Once the folder opens, search for the “compreg.dat” file and delete it.Once the Troubleshooting Information page shows up, go to Application Basics and click on Open Folder beside Profile Folder.Once the browser comes up, go to the address bar, type “about:support,” and hit the Enter button.Once the file is deleted, a new one will be created. You’ll have to delete the file to resolve the problem.

If the file becomes corrupt, it will cause different kinds of problems, the “File could not be saved” error being one of them.

It’s automatically created whenever you download or install any Firefox product, such as Thunderbird. The comprag.dat file is related to many Mozilla Firefox processes. Now it’s time to resolve the underlying causes of the error message. Other, less likely causes are as follows: Your internet connection is always the prime suspect, and yes, many users found that they weren’t correctly hooked up. Finding out how to remove the ‘File could not be saved because the source file could not be read’ error message from Firefox for Windows 10 involves knowing the underlying cause of the problem.

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