Question

Is there a way to clear up GM_log messages from error console from userscripts on a certain event?

I don’t want to clear up manually. On trigger of certain event, want to clear up the old log from the error console and show up the new log.

Answer 1

You cannot clear the error console. If you could, evil websites could clear it too and erase the record of their misdeeds.

You should no longer use GM_Log() anyway. Use Firebug and the excellent console logging functions it provides.

Then you can use console.clear().

Note, to avoid conflicts with Firefox’s newish console functions, and to ensure that the output appears in Firebug’s console, you may need to prefix the calls with unsafeWindow.

So your script could do something like this:

unsafeWindow.console.clear ();
unsafeWindow.console.time ('ScriptRun');

unsafeWindow.console.log ("Script start." );
unsafeWindow.console.timeEnd ('ScriptRun');

Which would look like this in the Firebug console:

— with all the preceding cruft erased. (Anything the webpage does after the clear() call will still appear though.)