try to upload any file via Elance.com

Do you mean via, or to Elance?

Can you provide a screen shot of the error message itself?

Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and

• Remove Cookies
  Warning ! ! This will log you out of sites you're logged in to.

Type about:preferences<Enter> in the address bar.

• Cookies; Select Privacy. Under History, select Firefox will Use Custom Settings. Press the button on the right side called Show Cookies. Use the search bar to look for the site. Note; There may be more than one entry. Remove All of them.
• Cache; Select Advanced > Network. Across from Cached Web Content, Press Clear Now.

If there is still a problem, Start Firefox in Safe Mode {web link} While you are in safe mode;

Type about:preferences#advanced<Enter> in the address bar.

Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.

Poke around safe web sites. Are there any problems?

Then restart.

Hello Fred,

Thanks for your reply.

Sorry i mean to Elance and i already uploaded some screen shots please review them.

Best

I did all things clearing cookies, cache etc this is an old problem for me

Do you have any kind of blocking add-ons or programs?

Did you try while in Safe Mode?

Yes i am using Adblock and tried in safe mode but same result.

Any more hints?

Thanks

Start your Computer in safe mode. Then start Firefox. Try Safe web sites.

Starting The Computer In Safe Mode;
Free Online Encyclopedia

Still no success

I've called the big guys to help you. Good luck.

Remove History For One Site Open the History Manager <Control><Shift> H. In the search bar, enter the name of the site. Right click on one of the listings and select Forget About This Site. This should remove all information, including any passwords / settings.