Shortcut to the Pinned List View
Every Salesforce record has an 18 character Id, and the first three characters are the prefix that indicates what kind of record it is (Contact, Lead, Opportunity, etc.) You can easily determine the prefix by going to a record page. Take a look at the URL for this Opportunity record; you can see that "006" is the prefix for Opportunity records.
Now that you know the previx, you can use it to jump to the pinned List View on any object tab: add the prefix right after the .com/ in the salesforce url. For example, to get to the Pinned List View for Contacts, just add "003" after the .com/ (those are zeros, not the letter O.)
OK, cool, but pointless, since it's faster just to click on the tab. Yes, but that can come in handy elsewhere. For example, if you call a Flow from a button or action, you can provide a return URL parameter — the page it will take you to after the Flow finishes. By using this shortcut URL, you go to the User's pinned list.
Package Installation Shortcut
You know how annoying it is when you need to install a managed or unmanaged package and the first thing you have to do is log in again, even though you're already logged in? This is especially frustrating if you're a dev or admin who has multiple orgs open at the same time. Here's a hack that you'll love.
A typical package URL looks like this: https://login.salesforce.com/packaging/installPackage.apexp?p0=04t5A123451njPx
If you click that, it's going to take you to the login page for Salesforce, as the first part of the URL would suggest. Instead of clicking it, you can just copy the part starting with "packaging" — packaging/installPackage.apexp?p0=04t5A123451njPx .
Now paste that after the .com/ in the Salesforce org you're already logged into, where you want to install the package. No log-in required.