Hi i need a simple way to determine whether KDE or GNOME is running. I am making an extension for Firefox and i need to run different programs depending on whether KDE or GNOME is running. I don't have access to any system variables in Firefox so it should be file based (see if a file is present or read contents of a file...). Currently i am checking if there is a file kdm.pid or gdm.pid in /var/run directory, but that really doesn't tell me anything as you can switch to gnome from KDM and kdm.pid will still be there.
I haven't been able to find anything in Google or this forum. But maybe i wasn't able to formulate correctly the search terms. If you can at least give me some pointers i'll be very grateful.
Thank you.

About the only thing I can think of would be running pidof gdm or pidof kdm, and checking the results. Although this wouldn't work if you had both running.

Thank you
Problem is there is no functionality in Firefox that allows me to get the result from externally executed program, or i haven't found it yet but i have been searching for this for a long time and have seen questions about that unanswered so i think it is not possible. However i could run pidof and redirect its output to a file which i can then read. But i am reluctant to so that because in order to know when to read the file i must run a function that will block until the external program finishes. The problem is that it will block the entire Firefox interface and if something goes wrong it will stay locked which is not very good user experience.
Maybe there is another way to get this data? Where does pidof take its data? Is it possible that i take it from the same place? May be from /proc directory? And doing pidof kdm/gdm wouldn't that be the same as checking the files i mentioned in /var/run - which i am doing now?
Thank you again