How to Import Opera 15+ bookmarks to Vivaldi?
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Theres no need to install another browser to convert the opera 15+ bookmark to a format Vivaldi could recognize. Simply install this extension in opera 15+ https://addons.opera.com/en/extensions/details/bookmarks-import-export/?display=en export your opera 15+ bookmark to HTML
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Just copying over the Bookmarks file from the profile directory of Opera into Vivaldi's profile directory should work too, both use the Chromium bookmarks format and model.
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