Downloaded images from Twitter or Google Images save with .bin format

[ekager]

Copied from: mozilla-mobile/fenix#3624

Also see: mozilla-mobile/fenix#2809

Same bug in Focus that a contributor tried to fix IIRC:
mozilla-mobile/focus-android#2743

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Steps to reproduce

1. Go to twitter.com
2. Long tap on an image and save image.

Expected behavior

The image has a .jpg file format.

Actual behavior

The image has a .bin file format. A saved image from Wikipedia articles is saved with .jpg file format.

Device information

• Android device: ?
• Fenix version: 1.0.1926 (#11750611)

Note

Bug filed from webcompat/web-bugs#33424

┆Issue is synchronized with this Jira Task

[Amejia481]

The issue here is that on some images on Twitter, we're not getting the file extension as part of the end of the URL, it is been passed as a parameter of the query string https://pbs.twimg.com/media/D964pzzX4AASSIz?format=jpg&name=4096x4096. For those edge cases, we could to perform an HTTP HEAD request on the URL to figure out the mime type.

This could add extra overhead to what we are doing now, an optimal solution is to wait for the Gecko-based DownloadManager and #1968 add the file extension when we have downloaded the file.

Depends on: #1968

[ekager]

Came here to bump this because someone reached out that this is their number one annoyance but see that @NotWoods is already making commits 🙌 😆