NiftySplit (Port) is a Firefox add-on that allows you to split your browser screen into two windows. Clicking on any link in the left window will load it in the right window, making it convenient to browse websites like Reddit or Wikipedia without losing the main page.
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Chrome's classic "NiftySplit" is now ported to that one other browser.
All credit goes to the extension's original author, Arno van den Brink. Seriously, this wouldn't be possible without him; I wrote very little actual code, and just tweaked a few things for Firefox compatibility. I can really take no credit for this.
From the Chrome store (and the original author):
Use NiftySplit to split [your browser] into two windows. Any link you click in the left window will load in the right window.
Is this useful? Yes!
You can now browse your favorite website and visit links without losing the main page. No need to use the Back button or open-and-close tabs all the time. This makes browsing websites like Reddit or Wikipedia a thing of pure joy.
Convenient and useful.
After you close the split window, it auto maximises the main one, which is very useful.
Though there is no shortcut, only right click -> open as NiftySplit window
And if you use for example a tab manager, that will open in the new window.
Note this 'splits' the window by opening another window and does not bisect the space within the open window.
Why would I care about that?
1. I modify my browser's interface so there are toolbars around the sides of the window creating space that having a second window open means the content is more crowded.
2. I use a tiling window manager, which bisects the screen already while positioning windows for me that means a lot less fidgeting with window position. When combined with this, it just gets overridden anyway by the window manager (if you don't use Linux, this will seriously never matter for you I know... except windows does provide auto-snapping already so why use a web extension for this?)
Not the dev's fault and the port is good so extra star for writing a firefox manifesat.json and dealing with that. If you want to port dualless that would be awesome ;]
Another star for doing what it says, minus 2 for this not being so useful.