hello, if your manual changes don't 'stick' after a restart of the browser, please look out for any suspicious extensions (like 3rd-party-toolbars or things you have not installed intentionally) presently installed under firefox/tools > addons > extensions or the programs section of the windows control panel and remove those entries.

in case this doesn't solve the issue please try this: go to firefox > help > troubleshooting information > profile folder - "show folder", then a new window will open up. in this window look out for a file named user.js (it might be used to overwrite your custom settings). in case it is present , delete or rename this file and restart firefox afterwards.

Remove a toolbar that has taken over your Firefox search or home page

How to fix preferences that won't save

You can also check the target field in the Firefox desktop shortcut via the Properties in the right-click context menu.

I tried. Nothing worked. I guess that is beacuse Addware like this one can change their names. Every time I change settings to normal and restart computer, ueep.com is there again!

Does anything come up if the open the about:config page and type ueep in the Search bar at the top of this page?

I change settings in about:config and make Google my deafult search engine (replace it with https://www.google.ba/search?q=) , but when I restart computer - all changes that are made dissapear and once again I have ueep.com as my home page, search engine etc.

could you go to firefox > help > troubleshooting information, copy the contents of that page and paste them here into a reply on the forum? this might give us a clue what is going on...

Moderator removed link that references paid software that users may not necessarily need.