Comment 15 for bug 304477

Think about it this way: having to use a different keybinding to clear
the cache is much less irritating than having (potentially) multiple
days of communication disappear with no ability to recall. Also, I would
guess that the number of people who use ctrl+L as a shortcut for the url
bar is much higher than the number of people who use it to clear a text
buffer.
Basically, a shortcut as frequently used as ctrl-L should not be a
destructive action that can't be reverted.
Probably the best solution would be a configurable shortcut for clearing
the cache.