The best alternatives to Fulldive Browser are Sizzy, Firefox Preview, and Glaze. If these 3 options don't work for you, we've listed a few more alternatives below.
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The goal of Sizzy is to save time and increase the productivity of designers and developers. Work on your website and instantly preview the changes on multiple devices at once.
Firefox Preview combines the speed, privacy, control, and easy-to-use features you have come to expect from Firefox. Thanks to the GeckoView engine, Preview is 2x times faster than earlier Firefox versions with Always-on Tracking Protection plus Collections.
Glaze is a floating browser built to view your favorite content right alongside your work! Glaze makes optimum use of the space available on your screen. Glaze can be put anywhere on your screen and give you the possibility to do multiple things at once.
This browser extension will boost your productivity by acting like the strict father you never had. It will block all those distracting websites, like the one you are on right now, until you get some actual work done.