What message(s) or error(s) are displayed?

What is the web address you are using?

The connection was reset

The connection to the server was reset while the page was loading.

   The site could be temporarily unavailable or too busy. Try again in a few moments.
   If you are unable to load any pages, check your computer's network connection.
   If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

Web address : www.national-lottery.co.uk

Something you could try very quickly. Disable your ADB Helper 0.7.3 extension.

Sorry this doesn't mean anything to me!!!!! Where do I find it ti disable it please?

If your virus protection has a subjects-filter-block (gambling, adult, etc) that could be the reason

Gambling sites not blocked and I was able to access it before and have not changed anything.

Start Firefox in Safe Mode {web Link} by holding down the <Shift (Mac Options) > key, and then starting Firefox. Is the problem still there?

Sorry but yes the problem is still there. I managed to get on this morning from a link in an email from the Lottery site but that is now giving the same problem again

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.

Last resort; 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.

Have gone on today and lo and behold I can now access the Lottery site-weird or what???

Thanks for help