Using dollar-store picture glass for print bed on top of original heated aluminum bed?
Picture frame glass (generally float glass) will work well enough, but count on it eventually cracking/getting chipped. It's always very flat (due to the way the production process works).

Taking it up to 100-110C for printing ABS should not be a problem, but you'll want to avoid sharp changes in temperature, and should be careful that your prints don't adhere too well: I've had PLA/PETG prints take out pieces of glass with them due to the force required to remove them from the build plate. You might want to try without any (or very little) adhesive first, and make sure your nozzle isn't too close to the build plate.