Here is how to copy/paste text to and from xterm.
First you need to enable "Select to Clipboard" in the VT Options menu. You can do so by holding Ctrl + Middle Mouse/Scroll button inside xterm. If you don't have the Middle Mouse/Scroll button but have it emulated by pressing both the Left + Right mouse buttons simultaneously, it should also work.
Once that is done, you can paste text you just copied (from Firefox for example) to xterm using Shift + Insert.
To paste text from xterm to Firefox, all you need to do is to select the text in xterm (use the Left Mouse button) and then paste (Ctrl + v) as you normally would in Firefox.
You can also use the Middle Mouse/Scroll button to paste text that you copied from xterm to itself. So you could copy text in xterm (select the text using the Left Mouse button) then paste using the Middle Mouse/Scroll button, or use Shift + Insert.
Don't forget to check the other xterm options, by holding Ctrl then using either the Left/Right/Middle Mouse buttons. There are quite a lot of options to the different menus.
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