added, get some good suggestion like instapaper, fipboard at Toptenalternatives but still looking for any addon for web browser which work same as Xmarks.
@commander238 It looks like to me that opera devs might have removed the add on for some reason. Either that or the extenison's dev requested it be removed. Either that or whoever typed the link made an error somewhere. That seems the most logical reason to me. A 404 error usually means that content attached to the link has been removed or the link was typed wrong when creating the page.
The same situation is for my small screensharing app. I'm waiting for a month!!! I don't know why they ran an extensions store at all if it is completely unsupported by team.
@armagan What are you talking about? Your reply makes no sense. Not to mention that the fact that you replied to a 10 month old topic to add absolutely nothing useful to it.