Perhaps I should have explained my purpose for this, in case it helps, or for possible workarounds.

I have a local website which uses .txt files for saving notes. (They are opened and processed further with Javascript). Firefox on Android opens the txt files in an external editor, where I can easily edit them and save them. But on Windows 10 I have some trouble doing this.

I have "always ask" but the file opens in Firefox. Mozilla did something similar with local pdf files but there is a remedy. I can't find one for text files other than downloading the file and opening it with your editor. There may be a bug report, otherwise you can file one. https://bugzilla.mozilla.org/

If the server sends the text file as text/plain then Firefox will open this file in a tab. You can possibly prefix the link with the view-source: protocol.

You can find these prefs on the about:config page to set what external viewer/editor to use.

• view_source.editor.args
• view_source.editor.external
• view_source.editor.path

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

If the server sends the text file as text/plain then Firefox will open this file in a tab.

Thanks for your reply.

That's what happens. I wonder why this is not configurable like with other file types.

I was able to add "view-source:" to the links but this did not seem to work. (Nor does the entire protocol seem to work. If I use the test link on http://www.javascriptkit.com/javatutors/links3.shtml nothing happens.)

Still you solved most of my problems. Using the about:config settings I am now able to open the txt file in Firefox, then use the "View Source" (Ctrl+U) option to open the txt with Notepad++.

That's a few more clicks than I'd prefer, but for now it's a decent workaround.

Still hoping for a direct solution, though.