IE compatibility

Here is another idea I'm carrying for the few last days. There are just too many internet sites written with IE specific instructions. Some of them are critical like banks, cellular communication companies, government and academic institutions. This presents a serious handicap for people using non Microsoft operating systems, since there are no compatible IE versions (not counting obsolete IE for Mac).
There are two possible solutions I have been thinking of:

1. To use Netscapes's approach, by integrating IE compatible engine into Mozilla, or adding IE specific instructions. The drawbacks are that it is legally problemtic and it will encourage even more progrmers to use the lazy IE specific code.
2. To learn from Microsoft and making Mozilla more programmer friendly than IE by adding extra instructions with better API, but unlike Microsoft, making it free.