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Gehigarri honi buruz
To turn GreyBackgrounds on, check the menu entry... View > GreyBackgrounds, or right-click anywhere on the page and check GreyBackgrounds. Uncheck either to turn it off.
Not all webpages look good and this is a very very rough version. I've made the background color slightly transparent to show images and elements that might otherwise be obscured, this can make some websites look sorta funky. I'll be tweaking the CSS aspect of this to get better results on more changes... it is rather difficult to create global rules for the entire internet that always works!