@Repter As I see on the extension support page in the Chrome Store, the developer knows about the problem in Opera. You need to wait for the next version of the extension in the Chrome Store or use the old version.
Yes, indeed it does, thank you! It appeared that I have to hold the wheel being pressed for the very long time (a couple of secs perhaps) to make a click successfuly. Guess I need another mouse, thought of Logitech better
@oplover I assume you are clicking a bookmark from the bookmarks bar. If so, I agree with you.
One workaround is to simply hold down the Ctrl-key when clicking on a bookmark from the bookmarks bar to open the bookmark in a new tab.
Maybe a better workaround would be to press Ctrl-Shift-B to open a bookmarks tab and then pin that tab for easy access to bookmarks in that pinned tab. When one clicks on a bookmark from this pinned tab's contents now, the bookmark will automatically open in a new tab.
Adding for posterity @avl that it appears that when a window's open for a while, even if the white bar does not appear (because I'm actively using that window), the display will become off-calibration with what's on the page, forcing me to move my cursor below where the link actually is to click on the link. The behavior fixes itself if I switch tabs.
I assume the problems are related.