Some details please... What website, OS of the other computer, browser on the other computer, Firefox version...

could not open a website in mozilla firefox but other computer this website is open & working

Website : www.wbcomtax.gov.in

OS : same windows xp sp2

browser : same mozilla fire fox

version : 34.0.5

Any addons not identical on both versions ?

no addons

could not open a website in mozilla firefox but other computer this website is open & working

Website : www.wbcomtax.gov.in

OS : same windows xp sp2

browser : same mozilla fire fox

version : 34.0.5

no addons open

You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Hold down the Shift key and left-click the Reload button
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Command + Shift + R" (Mac)

Clear the cache and remove cookies only from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes