Browser change

I have CC Cleaner version v5.45.6611 64bit on my computer. Every time I open Firefox it's open for a few minutes then down sizes to the tray. then when its reopened I get a message telling me cc cleaner is trying to change my browser settings. I looked at the settings in the program but can't find any thing tell me why it keeps trying to change the browser. Can any body help me with both of these problems please. I would appreciate any help you can give me. :(:(:( Thank you lee

That's a new one, but CCleaner version 5.45 has had a lot of problems.

CCleaner Version 5.45 has been officially withdrawn, and you are advised to reinstall v5.44 (or an older version, some have gone back to 5.40).

5.44 is now the version on the piriform download site: https://www.ccleaner.com/ccleaner/builds

5.44 and older versions are also available on Filehippo: https://filehippo.com/download_ccleaner/