I think you're burying the lede. You do finally mention, in the seventh paragraph, that your problem with existing browsers is that you have too many tabs. Your solution, apparently, is "spaces", a word mentioned zero times in the article -- just the name Space Browser, and no suggestion of how spaces work.

It would be more interesting to discuss the UX factors and why you think that is a sufficient diffentiator from existing browsers. Just "I wrote a browser and I hope it competes" is a far less interesting story.