Ha-ha stupid microsoft windows . I figured , that windows really removes a "read only" attribute when you uncheck the box in properties , but puts it back on once you click "ok" . So to activate Crossfire in FMM , you should :
1). Install fresh version of Freelancer , then FMM 1.3 , then Crossfire .
2). Restart and click F8 while OS is loading to enter Safe Mode .
3). In Safe Mode open Properties of Freelancer folder ,remove attributes ant DON'T click ok , instead click apply . Same for Crossfire folder in Freelancer Mod Manager\mods .
4). Start FMM and activate Crossfire .
5). Close properties and FMM .
6). Restart .
7). Profit .