When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Bypass Firefox's Cache

Use Ctrl+Shift+r to reload the page fresh from the server.

Alternately, you also can clear Firefox's cache completely using:

orange Firefox button (or Tools menu) > Options > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now"

If you have a large hard drive, this might take a few minutes.

(2) Remove your elance.com cookies (save any pending work first). While viewing a page on the site:

• right-click and choose View Page Info > Security > "View Cookies"
• Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies"

This will open a dialog where you can remove your elance cookies individually.

Then try reloading the page and logging in again. Does that help?

I assume Firefox 19 worked fine on the site?

Some sites may be mistakenly identifying Firefox 20 as Firefox 2, which is a very old version they probably no longer support. As a test, you could "lie" to the site about your Firefox version and see whether that little deception works.

This take a minute to set up. Here's how:

(1) Select and copy the following preference name to the clipboard:

general.useragent.override.elance.com

(2) In a new tab or window, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.

(3) In the filter box, type override and pause while the list is filtered

(4) Make sure general.useragent.site_specific_overrides is set to its default value of true (or right-click and choose Reset if it is not).

(5) Right-click anywhere in the preference list area and choose

New > String

then paste the preference name you copied. Click OK and enter TEMP or asdf or any text as a temporary placeholder. You should see the preference added in bold. Leave about:config open and switch back to this tab.

(6) Select and copy the following useragent string to the clipboard (it's all one line):

Mozilla/5.0 (Windows NT 6.1; rv:19.0) Gecko/20100101 Firefox/19.0

(That's Firefox 19 on Windows 7 32-bit)

(7) In about:config, double-click general.useragent.override.elance.com and paste to replace the temporary text with the new useragent string. Click OK, you're done here.

Now try reloading a page where you need to upload (use Ctrl+Shift+r) and test that function again. Any change?