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FireFox for Android has been doing this since I started using it two years ago.

• tomerv 14y ago
  I generally like the way Firefox implements the sidebar, but there's one problem with it - it doesn't work well with websites that expect horizontal gestures. For example, a drawing app wouldn't work very well.
• zobzu 14y ago
  Unfortunately they removed it in the Firefox Beta. According to screenshots they might put it back but it's not there yet. That was my favorite feature.