Absolutely. Does. Not. Work.

Using both MacBook Air circa 2015; MacBook Pro 2016; iMac 21” —
Fluid browser menu bar offers the option for screen opacity selection, but upon selecting any percentage option the app becomes completely unresponsive.
Cannot re-size Fluid browser screen/size, again, Fluid becomes unresponsive.
Fluid did not respond to ‘close app’ requests, or Activity Monitor shutdown. Force-Quit was required.
In addition, Safari, Google Chrome and Firefox have developed issues ever since PURCHASING and attempting to use Fluid browser.
I hope to get my money back from Apple as the developer is completely unresponsive.

fox7rot about Fluid Browser