Hi!
Is it possible to set links in comments to open in new tab as default? 
Thanks!
Yes, by enabling the default other external links in new tab setting.
After this setting is enabled it will only be applied to new accounts, existing users would have to change it in their account preferences.
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If you search you can find a way to change the settings for existing users at the rails console. It’s arguably not very polite, as some users might not want links in a new tab, but you can do it if you think your users won’t mind (or notice).