[PSA] Prevent M3U8 file from being saved to Downloads dir

[iamkroot]

I recently found that the playlist files were being saved to the downloads directory, even if they are set to "Open with MPV" in Firefox. I'd have to clean up the files every so often.
It has to do with this change: https://www.ghacks.net/2021/08/04/a-close-look-at-firefox-91s-new-file-download-opening-behavior/

I was able to go back to the old behaviour by setting browser.download.improvements_to_download_panel to false in about:config.

Just putting this here in case anyone else is also bugged by the change.

[grmat]

Firefox is shipped with the preference set to false by default on Arch Linux, so I didn't notice that. Thanks for the info.

[riyfu]

Setting browser.download.start_downloads_in_tmp_dir to true in about:config should fix this in Firefox 102 and up.

There is now an enterprise policy (StartDownloadsInTempDirectory) and an about:config pref (browser.download.start_downloads_in_tmp_dir) that will once again cause Firefox to initially put downloads in (a subfolder of) the OS temp folder, instead of the download folder configured in Firefox. Files opened from the "what should Firefox do with this file" dialog, or set to open in helper applications automatically, will stay in this folder. Files saved (not opened as previously mentioned) will still end up in the Firefox download folder.

From https://www.mozilla.org/en-US/firefox/102.0beta/releasenotes/