DownThemAll is not available for Opera but there are a few alternatives with similar functionality. The best Opera alternative is Ant Download Manager, which is free. If that doesn't suit you, our users have ranked more than 100 alternatives to DownThemAll and three of them are available for Opera so hopefully you can find a suitable replacement. Other interesting Opera alternatives to DownThemAll are Bulk Media Downloader and uGet Integration.
Efficient tool for downloading internet files, supports video services, multi-thread acceleration, browser integration, drag-and-drop, encrypted password storage, and more.
Bulk Media Downloader grabs and downloads all sort of media resources in bulk. You can filter different types to prevent cluttering the grabber window. It also has a pause button to stop appending more resources.
Integrate uGet Download Manager with Google Chrome, Chromium, Opera, Vivaldi and Mozilla Firefox.
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Before I was a user of DownThem All, but with the latest version of Firefox, the author of the extension has waived to continue developing it. I searched for several alternatives, and chose this one, because it offers complete control of downloads (a very informative download manager), very good integration with browsers, different file types, downloads of sets of files from a page, plus, with a button allows you to suspend or activate the integration. And many more features that I discovered.