ports/169366: www/xpi-* ports need re-install after each Firefox update

[Beeblebrox]

>Number:         169366
>Category:       ports
>Synopsis:       www/xpi-* ports need re-install after each Firefox update
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Jun 24 08:40:06 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     Beeblebrox
>Release:        9.0-STABLE
>Organization:
>Environment:
FreeBSD 9.0-STABLE #0 r235991: Sat May 26 14:20:06 EEST 2012 amd64
>Description:
I use Firefox and Seamonkey. I prefer to add some of the extensions for these apps through the ports infrastructure (www/xpi-*) instead of through the app's add-on menu.

After www/firefox is updated (or re-installed), then started, one sees that all the add-ons installed through www/xpi-* have disappeared, while add-ons installed through firefox's add-on menu remain. One must deinstall and reinstall every single www/xpi-* port one wants on his system in order to get firefox add-ons back the way they were before the update.

** I had previously submitted a PR concerning this, but there has been no response.
>How-To-Repeat:
Install Firefox, install any www/xpi-* port. Then remove Firefox and re-install it.

>Fix:
N/A

>Release-Note:
>Audit-Trail:
>Unformatted: