It's not easy to discover how much data usage a specific site triggers. Android reports data usage per app, if you dig into the right preference panel, but that

It's not easy to discover how much data usage a specific site triggers. Android reports data usage per app, if you dig into the right preference panel, but that's not going to tell you anything about specific websites. I'd like a notification to pop up when the current usage (within, say, a 3 minute window) exceeds my typical usage. That'd make it easier to notice a website started autoplaying a (muted) video, for instance. It's also something that could be done at the operating system level. The operating system could also conceivably show traffic by domain, but that's not ideal; you want traffic by referrer domain, ie. if the LA Times embeds megabytes of images from some random third party server, those should be aggregated under latimes.com and not under some meaningless CDN domain. But the OS probably doesn't have that information. Of course browser vendors could add more detailed reporting. Say a brief in-browser notification ("Page finished downloading 5 MB.") after initial load is complete and repeating if excessive downloading continues. I guess that could annoying really fast, though. A less annoying alternative would be a special page (e.g. "about:data-usage") that has an overview per page in a user-selectable time range. Maybe link to it from the browser start page.