Looking for a Firefox Extension/Userscript to Crosspost from Reddit to Lemmy/Piefed (or Copy Markdown Easily)

Hi everyone,

I’m looking for the easiest way to crosspost content from Reddit to Lemmy or Piefed. Ideally, I’d love a Firefox extension or userscript that can either:

• Directly crosspost, or
• Copy the post’s markdown (including title, text, and images) so I can easily paste it elsewhere.

Thanks in advance for any suggestions.