ideas for allowing browser extensions

Hi :-)

as a Surface RT user I liked the new windows , no crapware or viruses anymore . we gained a lot from the windows RT but there are some things that we lost ,most noticeably is browser extensions

I know that allowing extensions will be bad for normal user and most extensions are crapware , but there are few useful extensions , so what if Microsoft allowed extensions through the app store and every extension could be reviewed and approved by Microsoft .

what about you , what do you think of extensions , and how can Microsoft support extensions in windows RT ?