1.install wine
sudo apt-get install wine
2. install msttcorefonts (optional)
sudo apt-get install msttcorefonts
3. Download firefox version for windows (yes you heard it well – Thank you macromedia)
wget
http://ftp-mozilla.netscape.com/pub/mozilla.org/firefox/releases/1.5.0.3/win32/en-US/Firefox%20Setup%201.5.0.3.exe
run the setup
wine Firefox\ Setup\ 1.5.0.3.exe
4.Download the macromedia flash 8.5 setup
wget http://fpdownload.macromedia.com/get/flashplayer/current/fp8-5_beta/install_flash_player_8-5_beta.exe
Start the setup with wine
wine install_flash_player_8-5_beta.exe
point the plugins directory to c:\Program Files\Mozilla Firefox\plugins
5.start firefox with
wine .wine/drive_c/Program\ Files/Mozilla\ Firefox/firefox.exe
write about:plugins in the Url bar