Is it possible to download an add-on source code to edit and modify for personal use?

I would like to hire a developer to make some tweaks here and there and was wondering if it is possible and how I would go about doing so.

  • It is possible to download an add-on to the computer without installing
  • Subject to copyright issues, the code can be edited
  • In order to reinstall on release Firefox version, add-ons must be signed
  • Unsigned add-ons can be loaded on Nightly, Dev, or Unbranded Firefox

Thank you for replying.

You said its possible to download.

Where on the addon page is the download for the code or to edit code?

Easiest way is to install the addon then open you Firefox profile and get the source from there.

You can not edit the code on Mozilla site.

Right click on the download button, Save link as … then it will download