Allows you to hide almost anything via context menu 'Remove Object' or 'Remove Selection' with possibility of multiple undo of 'Remove Object'. You can also make a selection and chose "Remove everything else" to clear the page and only leave the selected text.
Once you decide what you want to Remove, Right click on it or select it, then select "Remove this Object" from the menu.
The effect of this extension is temporary, which is useful before printing a page, you can use another extension, 'Remove It Permanently' if you want your removed objects to be remembered.
If you move the mouse over "Remove this object" and wait for a second without clicking, the object that will be removed blinks in red.
If this bothers you and you want to remove it, you can go to about:config search for extensions.nuke_anything_enhanced.autoblink and set the value to empty.
If you want less intrusive blinking you can set it to "3px solid #ccc" or "1px dashed red" without quotes.
Please note that you can undo removing of objects only, undoing the removing of selections is not yet supported.