I assume you do not run the HTTPS Everywhere extension.

Can you try clearing all site-related data for your localhost (or whatever server name you are using)? This will clear site preferences, history, cookies, local storage, and bookmarks, so if you need to keep any of those, then do NOT do this.

To use "Forget about this site", you can use the Library dialog (Ctrl+Shift+h), right-click a history entry for the server, and choose Forget about this site. Since Firefox does a history search, if you have a lot of history, this can take a minute to run, during which time Firefox will be nonresponsive.

Any difference?

Thanks for the reply sir. let me explain you what i have done. i have an django app, i wanted to use ssl for that app so i made some changes in th setting.py file and reun the ssl server so it was working fine. but now i removed all the settings related to ssl. and running the server again but its still redirecting to https. i have made what changes u have said but still the same issue.

Does this problem affect any of your other browsers?

No sir. only in firefox i have this issue. and when i open private browsing and type http://localhost:8020/myappname its working fine. only giving error in the normal firefox browser.