Maybe you never know why default search engine become ask.com, because you installed free software, installed tool bar , etc.
And now you want to remove it and back to became google.com search as default search engine.
• Open your firefox browser
• In the address bar of your browser, type: about:config click Go or press Enter,
• Click I'll be careful, I promise
• Type keyword.url on Filter colomn
• Double click keyword.URL
• Change String Value, from https://www.ask.com....
• Click OK
Now, default search engine is already back to Google.com
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