Since I haven't used this LastPass master password since 2017, I'd have to remember which extensions I had back then, which is hard to do...
I may have had 1Password and Adblock Plus which you had/have too.
But it's hard to say. It's a possible vector (that you, dogman123 and I had the same compromised extensions) but also... why would the hackers have sat on our master passwords for nearly 4 years (in my case)?
It's looking like you got phished a long time ago, or installed malware which targeted the lastpass extension.
Did all of you use the same OS four years ago? (Windows perhaps?) Some malware targets Chrome/Firefox files on disk. A malicious extension probably wouldn't be able to affect your LastPass extension, but a malicious malware app could easily modify it.
Since I haven't used this LastPass master password since 2017, I'd have to remember which extensions I had back then, which is hard to do...
I may have had 1Password and Adblock Plus which you had/have too.
But it's hard to say. It's a possible vector (that you, dogman123 and I had the same compromised extensions) but also... why would the hackers have sat on our master passwords for nearly 4 years (in my case)?