Support for the Chrome apps has been discontinued for a long time. They do not work with any firmware versions since 1.5.5 which was released in January 2019, and they hadn't been actively developed for months before that. Using them means you are exposing yourself to risks and vulnerabilities in their code, and also exposing yourself to risks and vulnerabilities by using old firmware on your hardware device. This is not a recommended approach.

You can get your extended public key from Ledger Live by opening the relevant account, clicking on the "Edit account" icon in top right, and clicking on "Advanced Logs".