script is broken

[earthlng]

Hi there, long time no see :)

recent changes in Firefox broke your script:

1. multi-catch like this is no longer supported in FF59+

https://developer.mozilla.org/en-US/Firefox/Releases/59#Removals_from_the_web_platform

Javascript

• Non-standard conditional catch clauses have been removed (bug 1228841).

2. getComplexValue() doesn't support nsISupportsString anymore. (here and here).
   Probably since FF55: https://bugzilla.mozilla.org/show_bug.cgi?id=1345294

(1) is easy to fix and (2) depends on whether you still want to support older versions like ESR52.