Short answer: open the video, click the extension icon, click Download No Watermark. That's it — no account, no waiting, no license key. This whole path is free.
vm.tiktok.com share links and video CDN URLs aren't permanent; if you want to keep something, sooner is safer than later.Save videos you have the right to keep — your own, ones shared with you for that purpose, or strictly for your own private offline viewing. Downloading someone else's video to repost as your own isn't okay, watermark or not; if you're saving someone else's content, credit them and get permission before reposting anywhere.
A small download button is injected right into the page's action bar, next to like and comment. If it's already open in front of you, that's often the fastest route — no popup needed.
Got a link from someone else, or copied it from the TikTok app's Share sheet? Open the extension, paste it (short vm.tiktok.com links work) into the box, and click Go.
TikTok loads a page's video data once and doesn't always refresh it if you swipe to a different video without reloading — if the extension seems to grab the wrong clip, refresh the page (F5) on the exact video you want first. If parsing fails outright, the same fix usually applies: reload and try again.