WebExtensions API add-on for moving a tab to standalone window, without tabs bar, navigation bar and bookmark bar UI.
- Install Firefox add-on: PopupWindow on addons.mozilla.org
- Install Chrome extension: PopupWindow in Chrome Web Store
If you want to auto-enable the PopupWindow for specific web pages on FireFox, you can additional install the co-add-on https://github.com/ettoolong/WebAppMode.
- Install Firefox add-on: WepAppMode on addons.mozilla.org
For updating/creating language translations please create a pull request; for new languages please start with this file and translate it, storing it with the appropriate language tag (for a list of tags, see here).