Yes. Many developers choose to host their own add-ons. Choosing to host your add-on on <a href="%(amo_url)s">Mozilla's add-on site</a>, though, allows for much greater exposure to your add-on due to the large volume of visitors to the site. <a href="%(md_url)s">mozdev.org</a> offers free project hosting for Mozilla applications and extensions providing developers with tools to help manage source code, version control, bug tracking and documentation.
Yes. Many developers choose to host their own add-ons. Choosing to host your add-on on <a href="%(amo_url)s">Mozilla's add-on site</a>, though, allows for much greater exposure to your add-on due to the large volume of visitors to the site.  <a href="%(md_url)s">mozdev.org</a> offers free project hosting for Mozilla applications and extensions providing developers with tools to help manage source code, version control, bug tracking and documentation.