KISS Solution for Linux:
imv breathe.gif
-> imv: https://github.com/eXeC64/imv (or any other really lightweight gif viewer)
-> breathe.gif: https://quietkit.com/img/box-breathing-4x-v03.gif
-> Set it to a custom shortcut and press q to close window.
-> imv: https://github.com/eXeC64/imv (or any other really lightweight gif viewer)
-> breathe.gif: https://quietkit.com/img/box-breathing-4x-v03.gif
-> Set it to a custom shortcut and press q to close window.
Chrome extension: https://github.com/b3ting/breathe