I really hate the behavior of Firefox in Windows when you open the options. The complete browser window is not accessible anymore until you close the options again. This is extremely frustrating if you want to test a few settings. There is however a really nice way to change the behavior and make it that the options window is independent from the Firefox browser.
To do this you only need change one setting in Firefox and restart the browser afterwards.
The setting is automatically active once you make the change. It is probably best to test it out right away by opening the options window in the browser. If everything turned out fine, you should be able to browse the options window and all Firefox tabs in the window the options window was spawned from.
The options window looks different from the known one. There is only a close button now which means that the settings take effect immediately. This means that changes take effect even before you hit the close button. This is excellent if you want to test some settings.
This is also pretty useful if you write about settings in the browser, or want to copy values and paste them from a site in the options or the other way around. A tweak site for Firefox may display lots of tweaks on a single page that you need to scroll. With the new options window, you can modify all the settings and scroll the page at the same time.
There is another way to handle this. Instead of modifying the Firefox preference, you can simply spawn a new window and open the options from that second window. This does not affect the first window in the slightest, so that you can use it as usual even with the options open.
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