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Reload all tabs?
This used to be possible in the old Opera, you could just set a keyboard short-cut for it. Does anyone know a way to do this in O15+?
Not in the native browser itself, but via extension? Sure.
I suggest you try this: Reload All Tabs extension (in the Chrome store).
And you can do the reloading of all tabs via a button, or through the keyboard shortcut, Alt-Shift-R
Now there are other reload tab extensions in the chrome store that use a button, but a quick look didn't show that they gave you the keyboard shortcut also.
Anyway, to download a Chrome extension, you need the Opera extension called, Download Chrome Extension. https://addons.opera.com/en/extensions/details/download-chrome-extension-9/?display=en