Download Status Bar {web link} If you are the kind of person who likes to have total control over every aspect of your downloads, "Download Status Bar" is the add-on you are looking for.

thank you for your reply.

i know this add-on and already used.but condition of progressing is not shown on the task bar. i would like to confirm progression on task bar for example,when firefox is minimized.also i know this problem is concern system of windows.so i checked my pc with cmd.scanned and error has been fixed.other browser which is cyberfox,chrome also has similar function.their functions are working.i cannot figure out what happened only firefox 29.0.1 could you please inform me the best solution.

regards