On your computer, open Chrome.
   At the top right, click More More.
   Click More tools and then Clear browsing data.
   At the top, choose a time range. To delete everything, select All time.
   Next to "Cookies and other site data" and "Cached images and files," check the boxes.
   Click Clear data.

   Some settings on sites get deleted. For example, if you were signed in, you’ll need to sign in again.
   If you turn sync on in Chrome, you’ll stay signed into the Google Account you’re syncing to in order to delete your data across all your devices.
   Some sites can seem slower because content, like images, needs to load again.

   Cookies are files created by sites you visit. They make your online experience easier by saving browsing data.
   The cache remembers parts of pages, like images, to help them open faster during your next visit.

Try to sign to my gmail using latest firefox on window 7 and this what is displaying:Clear cache & cookies When you use a browser, like Chrome, it saves some information from websites in its cache and cookies. Clearing them fixes certain problems, like loading or formatting issues on sites. Computer AndroidiPhone & iPad In Chrome On your computer, open Chrome. At the top right, click More More. Click More tools and then Clear browsing data. At the top, choose a time range. To delete everything, select All time. Next to "Cookies and other site data" and "Cached images and files," check the boxes. Click Clear data. Learn how to change more cookie settings in Chrome. For example, you can delete cookies for a specific site. In other browsers If you use Safari, Firefox, or another browser, check its support site for instructions. What happens after you clear this info After you clear cache and cookies: Some settings on sites get deleted. For example, if you were signed in, you’ll need to sign in again. If you turn sync on in Chrome, you’ll stay signed into the Google Account you’re syncing to in order to delete your data across all your devices. Some sites can seem slower because content, like images, needs to load again. How cache & cookies work Cookies are files created by sites you visit. They make your online experience easier by saving browsing data. The cache remembers parts of pages, like images, to help them open faster during your next visit. Need more help? Try these next steps: Post to the help community Get answers from community members . Kindly assist to fix this. Thanks.