CCleaner always has bugs even though it's always there's new version

Because CCleaner is now Avast (Avast becoming Norton)
ccleaner v.5.88.9346 (64bit) erased calender of Thunderbird 91.4.0 - CCleaner Bug Reporting - CCleaner Community Forums
Wiping Free Space Can’t Pass 32% Complete - CCleaner Bug Reporting - CCleaner Community Forums

CCleaner has messed my pc up - CCleaner Bug Reporting - CCleaner Community Forums

@f23948, I am using CCleaner Free v5.88.9346 (64-bit) w/o any issues and I like to whitelist the cookies that are most important to me along with Microsoft Edge Chromium & that's it.

I do not use CCleaner Free to wipe Free Space or any other features.

When Avast first took it over, I didn't use CCleaner Free for a couple of months due to the complaints I was reading about but once I started using it again, I've been fine.

You use Firefox ESR as your browser. Have you inquired within Firefox ESR support about using CCleaner?
--- I'm not familiar with using Firefox ESR, but maybe they have the capability to do what CCleaner is supposed to do?

Since CCleaner has messed up your PC, are you able to recover your PC?

MeAndMyComputer
I just wanted to let you know I just wants to share the CCleaner forums with you guys

CCleaner has a driver updater facility that seems to work on the same lines as the old cowboy registry cleaner scams -

click here to speed up your pc
you download a so-called optimizer (and lord knows what else)
the scan finds 3,000 'errors'
click here to fix > but the fix costs £££££

My test >

First I made a full Macrium image of my very up to date Windows 11 computer.

Then I clicked CC driver updater. The 'software' found 21 out of date drivers. I clicked to update, only to find I needed to sign up for a CC Premium trial (with a view to buying the full version) in order to get my driver updates.

I clicked OK to sign up, OK to update the drivers.

In about 5 milliseconds it said updated 1, not required 20. From my experience of driver updates, nothing updates in 5ms. It was a scam.

I put my Macrium usb in, clicked restart and was back to normal in 10 minutes.

YMMV of course...

ccleaner is a tool in my bag that i will use once i have exhausted all of my other options. If things are still broken, I will use a tool like ccleaner to see if I can resolve the issue.

So, i never use ccleaner as a proactive maintenance tool.

Avast (Avast becoming Norton) is not real CCleaner
Former Piriform used to be real CCleaner

Personally I no longer use CCleaner because of Avast becoming Norton now Norton includes Crypto Mining
Norton and Crypto mining. | Windows 11 Forum

Because I switched from CCleaner to BleachBit then I switched from BleachBit to Glary Utilities
[Fixed in 5.89.9401] CCleaner 5.89.9385 immediately closes on launch - CCleaner Bug Reporting - CCleaner Community Forums

Not fixed in 5.89: CCleaner not deleting Chrome cookies - CCleaner Bug Reporting - CCleaner Community Forums

1.25.2022 Update Broken - CCleaner Bug Reporting - CCleaner Community Forums

CCleaner Crash - CCleaner Bug Reporting - CCleaner Community Forums

CCleaner ... I don't want to you to analyze my cookies! - CCleaner Bug Reporting - CCleaner Community Forums

[Fixed in 5.89.9401] CCleaner 5.89.9385 immediately closes on launch - CCleaner Bug Reporting - CCleaner Community Forums