At the moment mailnews shares opentabfor.middleclick pref with the web links and users may not want different behaviour for web links versus messages / folders. Whilst here let's expose opentabfor.doubleclick (which only has a meaning in mailnews) and correct the help for browser opentabfor.middleclick pref.
Bug 1727948 Comment 0 Edit History
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At the moment mailnews shares opentabfor.middleclick pref with the web links and users may not want different behaviour for web links versus messages / folders. Adds Ctrl-Enter / Cmd-Return behaviour to folder and thread panes. Whilst here let's expose opentabfor.doubleclick (which only has a meaning in mailnews) and correct the help for browser opentabfor.middleclick pref.