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Firefox won't let me drag-and-drop files from automatically-opened .zip archives into Windows Explorer

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I am using Windows 7 Pro SP1 64-bit (fully updated) and Firefox 68.0 64-bit.

The problem is that when I download any .zip archive and tell Firefox to "Open with... 7-Zip File Manager" (or with Windows Explorer), after the archive has finished downloading and opened in a 7-Zip window (or an Explorer window), I cannot drag-and-drop the file contained in the archive onto a Windows Explorer window or the desktop. No matter where I try to drag the file to, the Windows mouse cursor is always a "cancel" icon and won't let me drop it anywhere.

If I then close the archive window and reopen it from the download folder (C:\Users\user_name\AppData\Local\Temp), now I can drag-and-drop correctly.

I know that this is a problem with Firefox, because if I try the same operation with the same .zip archive using the current version of Tor Browser (8.5.4 32-bit (based on Mozilla Firefox 60.8.0esr)) or with Internet Explorer (11.0.9600.19399) I do not have this problem.

Any help would be appreciated.

I am using Windows 7 Pro SP1 64-bit (fully updated) and Firefox 68.0 64-bit. The problem is that when I download any .zip archive and tell Firefox to "Open with... 7-Zip File Manager" (or with Windows Explorer), after the archive has finished downloading and opened in a 7-Zip window (or an Explorer window), I cannot drag-and-drop the file contained in the archive onto a Windows Explorer window or the desktop. No matter where I try to drag the file to, the Windows mouse cursor is always a "cancel" icon and won't let me drop it anywhere. If I then close the archive window and reopen it from the download folder (C:\Users\user_name\AppData\Local\Temp), now I can drag-and-drop correctly. I know that this is a problem with Firefox, because if I try the same operation with the same .zip archive using the current version of Tor Browser (8.5.4 32-bit (based on Mozilla Firefox 60.8.0esr)) or with Internet Explorer (11.0.9600.19399) I do not have this problem. Any help would be appreciated.

Modified by WillW

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philipp
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hi will. this is the result of security improvements going into the recent firefox version. the best way to fix this problem would be to turn on UAC again on your system - more information about this is available at Running Windows as Administrator with Launcher Process Enabled Causes Drag and Drop Errors - How to Fix

hi will. this is the result of security improvements going into the recent firefox version. the best way to fix this problem would be to turn on UAC again on your system - more information about this is available at [[Running Windows as Administrator with Launcher Process Enabled Causes Drag and Drop Errors - How to Fix]]
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Question owner

Thank you for the reply Philip. According to that article, the drag-and-drop restrictions only apply with "Launcher Process Enabled." But what exactly is the Launcher Process? I can't find any information on this with an internet search.

It would be disappointing if the only two fix options are either to deal with UAC or to disable Firefox's security improvements. But could I just disable the Launcher Process?

Thank you for the reply Philip. According to that article, the drag-and-drop restrictions only apply with "Launcher Process Enabled." But what exactly is the Launcher Process? I can't find any information on this with an internet search. It would be disappointing if the only two fix options are either to deal with UAC or to disable Firefox's security improvements. But could I just disable the Launcher Process?
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jscher2000
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Hi WillW, there is a preference to disable the Launcher Process feature, but we're all new to it so we don't know the implications. If you want to try it:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful or accepting the risk.

(2) In the search box above the list, type or paste launch and pause while the list is filtered

(3) Double-click the browser.launcherProcess.enabled preference to switch the value from true to false

Hi WillW, there is a preference to disable the Launcher Process feature, but we're all new to it so we don't know the implications. If you want to try it: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button promising to be careful or accepting the risk. (2) In the search box above the list, type or paste '''launch''' and pause while the list is filtered (3) Double-click the '''browser.launcherProcess.enabled''' preference to switch the value from true to false
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Question owner

Thank you for that information jscher. I don't think I'll try disabling it without knowing what the consequences would be, but I'm glad to at least know how.

I do hope Mozilla is planning on providing documentation about this before too long.

Thank you for that information jscher. I don't think I'll try disabling it without knowing what the consequences would be, but I'm glad to at least know how. I do hope Mozilla is planning on providing documentation about this before too long.
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philipp
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with turning off the launcher process altogether you're worse off security wise than using the workaround described in the article - that's not a recommended way to proceed...

edit: some more information about what the launcher process is doing is available in this mailing list entry: https://groups.google.com/d/msg/mozilla.dev.platform/xSyK4r54Ifs/ncc-8irMDAAJ

with turning off the launcher process altogether you're worse off security wise than using the workaround described in the article - that's not a recommended way to proceed... edit: some more information about what the launcher process is doing is available in this mailing list entry: https://groups.google.com/d/msg/mozilla.dev.platform/xSyK4r54Ifs/ncc-8irMDAAJ

Modified by philipp

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jscher2000
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What happens if you use Save in the Download dialog and then launch the ZIP from the Downloads arrow list on the main toolbar? Is 7-Zip still run with reduced privileges or does it run normally in that case?

What happens if you use Save in the Download dialog and then launch the ZIP from the Downloads arrow list on the main toolbar? Is 7-Zip still run with reduced privileges or does it run normally in that case?
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Question owner

jscher2000 said

What happens if you use Save in the Download dialog and then launch the ZIP from the Downloads arrow list on the main toolbar? Is 7-Zip still run with reduced privileges or does it run normally in that case?

The answer is that 7-Zip (or Windows Explorer, if I set it as the default .zip handler) still runs with reduced privileges, just as if Firefox had opened it automatically. So, drag-and-drop doesn't work with that method either.

''jscher2000 [[#answer-1237108|said]]'' <blockquote> What happens if you use Save in the Download dialog and then launch the ZIP from the Downloads arrow list on the main toolbar? Is 7-Zip still run with reduced privileges or does it run normally in that case? </blockquote> The answer is that 7-Zip (or Windows Explorer, if I set it as the default .zip handler) still runs with reduced privileges, just as if Firefox had opened it automatically. So, drag-and-drop doesn't work with that method either.

Modified by WillW

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jscher2000
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I'm really puzzled about how this works, but I'm running Windows 10 with the default UAC setting (which isn't very obtrusive any more; far different from Windows XP SP2) so I can't test out what you're experiencing.

I'm really puzzled about how this works, but I'm running Windows 10 with the default UAC setting (which isn't very obtrusive any more; far different from Windows XP SP2) so I can't test out what you're experiencing.
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Question owner

It makes sense to me what Mozilla did, from a security perspective. Adds a bit of hassle for a minority of users like me, but the trade-off is probably worth it.

It makes sense to me what Mozilla did, from a security perspective. Adds a bit of hassle for a minority of users like me, but the trade-off is probably worth it.
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