How to change control-tab in Notepad++ to web browser style?
- Browse the menu Settings / Preferences / Misc
- Look for the box Document Switcher
- Uncheck both 'Enable' and 'Enable MRU behaviour' (whatever that is)
This answer by Luke Scammell has a very full explanation, as well as instructions for creating your own preferred keyboard shortcuts (I prefer Alt+LeftArrow and Alt+RightArrow).
Note that in the current version of NP++ (6.6.7) the lines to change in Settings / Shortcut Mapper are lines 219/220 (about 7 up from bottom of list).
Also, Luke includes an autohotkey macro/script that allows you to retain the default NP++ behaviour, but still use your preferred keyboard shortcuts in addition to the defaults.