Change the "Manual" browser command pref's name to allow for a relatively simple
migration of an existing value from the path pref to the new string pref. As I
note in the comment in the migration code, I realize this will break things for
and confuse those users who use the same config directory for mutliple versions
of Pidgin, but I'm not inclined to devise a solution that will make that work.
The solution I've implemented fixes the most important case--users who upgrade.
The rest of the world will just have to move on. Refs #12024.
--HG--
extra : convert_revision :
4dcc20a7e5c588d87cd629f143fd5d1118499f65