rajeevsshastri said

unable to open few sites such as 99acre.com. problem loading page message displayed

In this case the correct URL is : 99acres.com (you left out
the "s") .....

Your system details show that you're using a very, very old Firefox version .....  :(

Would you please update to the latest version, which is 66.0.3

If you still have problems, would you try this please :

Clear the Firefox cache :
https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

"Remove the cookies" from websites that cause problems :
https://support.mozilla.org/en-US/kb/delete-cookies-remove-info-websites-stored (scroll down to : "Delete cookies for a single site")

Just to re-iterate, you really really really need to update your Firefox. Please download the newest version from www.getfirefox.com

This website only supports TLS 1.1 and 1.2 and that requires Firefox 27 or later.

• https://www.ssllabs.com/ssltest/analyze.html?d=www.99acres.com&s=69.192.243.179&latest

Is this Firefox 24 ESR you currently use (Help -> About Firefox) ? Any specific reason that you haven't updated Firefox in such a long time? If you want to stay on the ESR update channel then consider Firefox 60 ESR.

Firefox 60.6.1 ESR:

• https://www.mozilla.org/en-US/firefox/organizations/all/
• https://www.mozilla.org/en-US/firefox/60.6.1/releasenotes/
• https://www.mozilla.org/en-US/firefox/60.6.1/system-requirements/