Opera extension NEX format, removed jsonp, increased ICO cache

Added Opera extension NEX format
Removed non-standard file extension jsonp
ICO browser cache increased to 1 month
Avoided user-select: text dublication
Revert "Avoided user-select: text dublication"

This reverts commit bf16b55b294f91d477adf9a4fb06d5d7196bc35e.
Avoided user-select: text duplication