I read about one a few years ago, but I can’t seem to find anything about. Is their still one, how can I install it?
The install.rdf has not been updated but I would imagine you could still install it when you manually update it:
https://community.activestate.com/xpi/oracle-database-explorer
Is it abandonware?
Not exactly, if we hear there are issues with it we will definitely attempt to fix it. Additionally we’re still going to be moving over a lot of these older extensions to 9.0, so you dont need to be editing any install.rdf files.
That said if you (or anyone) is interested in taking over development please be sure to let us know 