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A Better Screenshots Tool and More – These Weeks in Firefox: Issue 156
(blog.nightly.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
While the left mouse button is held down, I can put the window on the left or the right. I have no concern. But I noticed the difference compared to Chrome. In Chrome, the new window is there while the left mouse button is held down. In Firefox, it's a thumbnail.
For many monitors, I never had more than 1 monitor, so can't talk re it.