Adds a checkbox to every file on Dropbox share-link pages, in both list and grid view. Select any files, then either save them one by one with "Copy to Dropbox" on the same page (the new-tab event is the success signal and is intercepted), or send them straight to the browser downloader. Shift-click and Ctrl/Cmd+A work too. The UI blends into Dropbox's own native layout.