Here's a bookmarklet you can use to enable zoom:

    javascript:m=document.querySelector('meta%5Bname=viewport%5D');m.content=m.content.replace(/.*(width=%5B%5E,%5D+).*/,%22$1,maximum-scale=10,minimum-scale=0.1,user-scalable=1%22);

I found it on HN a while ago, I wish i knew where. To add it bookmark another page then go into bookmarks edit mode and change the URL to that.