Try clearing your browser cache.

Tools > Clear Recent History... - hit Details and make sure only Cache is selected, then select Everything and hit the Clear Now button.

Thanks I tried that but still got problems, but maybe not Firefox seems like a memory thing keyboard entries slowing to a crawl it seems to be a graphics thing but also broadband very sticky but speed monitor shows normal - b***** computers twin Zeon processors with a 1Gb graphics card running like an XT. no obvious nasties virus checks clear, no spyware, defragged, registry cleaned heats sinks & fans cleaned running out of options!!!!!

The default of the pref network.http.max-connections has been increased from 30 to 256 in Firefox 6+ versions.

Try to decrease the value of the pref network.http.max-connections from 256 to 30 as used in Firefox 3 versions.

• https://support.mozilla.com/kb/Firefox+never+finishes+loading+certain+websites

If you (or an extension) made changes to other network.http prefs like enabling HTTP pipelining (network.http.pipelining) then reset those prefs via the right-click context menu.

• http://kb.mozillazine.org/about:config

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

Thank you for suggestions, for whatever reason everything has returned to normal initially clearing cache etc had no effect but today when switching on Firefox & emails are working normally. I'm keeping my fingers crossed, thanks again for advice. Keith