I know you an subscribe to an RSS feed to get the questions for specific tags. I wonder if there are any tools beside email, like browser plugins to get noticed, as I'm not using any RSS reader.
Well, there's always email: (removed re question update)
You could just leave the page browsing those tag(s) open on a tab somewhere, and it will notify you of new questions in the title bar:
and on the page:
(which you can click to get the new questions)
You can monitor multiple tags this way, for example here's java, .net and python on stackoverflow
IFTTT is always a great tool for this kind of thing. Here's my recipe for getting an email on a new question in a tag: https://ifttt.com/recipes/104384
Did you noticed the " question with new activity".
Are you looking for this kind of feature, if yes, then it is already implemented.
The subscribe function and the RSS feed on tags are separate features. One allows you to get email notifications of questions in a tag. The other you read with an RSS reader.
To use, simply hover over a tag to get the tag card and click subscribe.
I came up with this hack. I use the RSS notification alert extension for chrome and add the RSS feeds for the specific tags.