Firefox command "register URL echo"

Anyone have experience with the Firefox command “register URL echo” ?

The entry in the AS dictionary is:
register URL echo‚v : Register a URL echo handler. The handler will get called whenever a new URL is loaded
register URL echo type class : signature of listener
What means “signature of listener” ?

My Event Log is:
tell application “Firefox”
register URL echo «handler fhndl»
“Firefox got an error: Can’t make some data into the expected type.”

There is an older topic with the same question:

Thanks, DL

Model: G5
AppleScript: 1.10.7
Browser: Firefox 2.0
Operating System: Mac OS X (10.4)

After a bunch of googling, I’ve only found failures to get this to work. Firefox 2’s AppleScript support is nearly non-existent.

Hi Dan,

What are you trying to do?

John M

Thanks to both Adam and John.

I’m afraid of that.

I’m trying to built a “Surf Monitor/Filter” for Firefox (Parental Control). I know there are other solutions:

  1. Idle Handler. For me the most inelegant method.
  2. Firefox Add-ons. For example ProCon works ok, but it can be disabled by any user and it is not
    compatible with Firefox 2.0 anyway.
  3. Other browser. Safaris built-in parental control is unfit.

Actual I’m testing PreFabs “UI Actions” (Trial Version) attached to Safari. GUI-Scripting on Firefox (yes it’s my favorite) is not possible.