Hi, Right Thimble Don't have the image upload option.

You can add it to Public Image uploads, Make sure you need an Image Direct link.

Public Uploads

• Dropbox
• Flickr
• Google Drive / Picassa

Thanks :)

Hello,

I Hope your problem has been resolved.

If you have not already, please mark this thread as solved by marking the solution.
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I hope you continue using our products and thank you for contacting Mozilla Support.

Hi Star Light You can Upload File on wiki.mozilla.org after signing up. or you can use Dropbox,One Drive,Google Drive etc.. to upload your image file