So you downloaded a theme for Chrome a while ago and don't remember which one it is?

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You can go to chrome://settings/appearance (on Chrome 61+) to see the theme's name, and click a link to open it in the Chrome Web Store.

If you are on an older version, or if the above no longer works, you have to check Chrome's Preferences file.

Linux

/home/YOUR_USER_NAME/.config/chromium/Default/Preferences

OSX

/Users/YOUR_USER_NAME/Library/Application Support/Google/Chrome/Default/Preferences

Windows

C:\Users\YOUR_USER_NAME\AppData\Local\Google\Chrome\default\Preferences

1. Open that file with a text editor and search for "theme":{"id" to reveal the theme's Chrome Store ID.
2. Next, search for that ID in the Chrome Store.
3. You should now see your theme as the only search result.

Note that if you just installed a theme, its ID will not yet be stored. You have the quit Chrome so it saves its Preferences file.

Quick one-liner for Linux:

google-chrome "https://chrome.google.com/webstore/search/`cat ~/.config/chromium/Default/Preferences | sed -ne 's/^.*"theme":{"id":"\([A-Za-z0-9]*\)".*$/\1/p'`"

That will extract your theme ID from the Preferences file, and directly open the Chrome Store search form.