extension cannot find glade ui file

[Mjumbe Poe <mjumbewu gmail com>]

i'm trying to use a glade file from a seed extension for epiphany.  i
put the glade file in the extensions directory, but when i call for
it, i get the following error:

** (epiphany:10702): WARNING **: Exception in closure (0x9fe3fd8) for
signal handler (handler [anonymous]). Line 80 in
/[HOME]/.gnome2/epiphany/extensions/browser-identification.js:
GFileError Failed to open file 'browser-identification.glade': No such
file or directory

i double checked the filename, just in case.  is there a different
place the extension would be looking for the ui file?  the line the
error references is pretty straightforward:

...
[79]    var builder = new Gtk.Builder()
[80]    builder.add_from_file("browser-identification.glade");
...

any thoughts?
thanks,
- mjumbe