kaled - 4:58 pm on Nov 5, 2010 (gmt 0)
it is very hard to fix bugs when third-party apps can be involved
Assuming you are talking about extensions and plugins, this may be the line that Mozilla use but where memory leaks are concerned it is complete tosh. All memory allocations should go through the main program, therefore tracking down leaks should be straightforward. As for other bugs...
If the interface is well designed and implemented, extensions and plugins should never destabilise the main program (or other extensions). If they do, the fact that they are able to do so is a bug in the main program.