Backup your Mac.
1. Try reset and repair.
Reset Chrome and test. https://support.google.com/chrome/answer/3296214?hl=en
Reset Firefox and test. https://support.mozilla.org/en-US/kb/reset-preferences-fix-problems
Repair Disk and test. macOS Mojave https://support.apple.com/guide/disk-utility/repair-a-disk-dskutl1040/mac
macOS High Sierra https://support.apple.com/guide/disk-utility/dskutl1040/16.0/mac/10.13
2. If this doesn’t help, download EtreCheck: https://etrecheck.com/maspro and post the report here.
Click, “Free Download” button and then “Click to download” button,
open Downloads folder, click on it to open, and then select ”Open”.
Click on the bouncing EtreCheck icon in the Dock.
“Choose a problem” from the popup menu box, and then “Start EtreCheck” in the dialog.
Click “Share Report” button in the toolbar and select “Copy report” .
Paste the report when you reply.
Note: This is a diagnostic test. Reading the report will help us not make unnecessary suggestions.