time machine

Please refer to Back up your Mac with Time Machine.

NOTE:

1. The EHD you use must be formatted to APFS or Mac OS Extended (Journaled). If your EHD is not, please use Disk Utility (Applications - Utilities - Disk Utility) to format the EHD, you can find lots of youtube videos that show how this is done.
2. ALSO, NEVER EVER share a Time Machine EHD to store data and to also use for Time Machine, the EHD should be dedicated to TM only!!!

It will help us get a good idea of what is causing your problem if you provide a report of your system, that way we do not have to play 20 questions with you. The report we are requesting does NOT provide any personal information and is extremely safe to use. Please navigate to www.Etrecheck.com and download the free version of EtreCheck. Once you have you downloaded the app and installed it, please run the report and save it.

When you have your report, you can attach it when you reply to this message and we can then review it and help you determine what is needed to get your system running well again.

For instructions on how to download your EtreCheck report and attach it to your reply to this message please click https://discussions.apple.com/docs/DOC-250000211

Please boot into Safe Mode and see if you can download another browser. If you cannot get another browser then you will need to boot into the Recovery Partition (hold down Command + R on startup) and reinstall Mac OS . This type of installation should not wipe out your data however it is always wise to have a backup in advance in the event you have a problem.

Before going to the trouble of re-installing Mac OS please answer the following:

Do you have any third party Antivirus, cleaning or ANY other third party maintenance apps installed?

Your welcome, I was thinking it was something like that. You may be a good candidate to investigate Malwarebytes and use it to catch any adware or other malware you happen to download.