Hello Md Robiul Hasan, ​It is frustrating when one browser underperforms while others work correctly. Since Chrome and Edge are working fine, we can rule out your internet connection as the cause. The issue is likely isolated to Firefox’s internal configuration or cached data. ​Please try the following technical steps to resolve this: ​1. Clear Cache and Cookies Corrupted site data can prevent pages like LinkedIn from loading correctly. ​Go to Settings > Privacy & Security. ​In the Cookies and Site Data section, click Clear Data. ​Select both options and click Clear, then restart Firefox and try logging in again. ​2. Test in Troubleshoot Mode Sometimes an extension (like an ad-blocker or an outdated security add-on) can interfere with page loading. ​Go to Help > Troubleshoot Mode... and click Restart. ​If the websites load smoothly in this mode, it means one of your extensions is causing the problem. You can then re-enable them one by one to find the culprit. ​3. Check Proxy Settings Firefox has its own network settings which might differ from your system settings. ​Go to Settings and search for "Proxy". ​Click Settings... at the bottom. ​Select "No proxy" or "Use system proxy settings" and see if the pages start opening on the first attempt. ​4. Disable DNS over HTTPS (DoH) Sometimes Firefox’s secure DNS feature can cause a delay or failure in resolving certain websites. ​Go to Settings > Privacy & Security. ​Scroll down to Enable DNS over HTTPS (under the "Security" section). ​Try setting it to "Off" temporarily to see if it improves page loading speed. ​5. Check "Enhanced Tracking Protection" For sites like LinkedIn, strict tracking protection can sometimes break the login flow. ​Click the Shield icon to the left of the URL bar when on LinkedIn. ​Try toggling the switch OFF for that specific site to see if it resolves the login issue.