Let's say, if there are many data and caches stored on my browser,
and I don't open any tab, can the phisher (scammer) steal these data/caches ?
thanks before
1. Browser Level caching - Different browsers cache data on different websites to provide repeatedly asked content without downloading it again from the server.
2. Cookies - Injected by the developers on their websites to track either user-activities or keep a check on re-visiting users.
The data available in the cookies is accessible for the developers who implemented them. Browser level caching resides in your browser's localStorage/indexdb.
To answer your question: It all depends on what type of data is cached in your browser/cookies! This type of data usually includes recently requested images/form data/other text. A scammer wouldn't access sensitive data such as your private keys from the wallet using caches. It's a safe practice to clear caches every two weeks for so as that also makes your browser a bit faster. If you're using chrome, CTRL +SHIFT+ R does clear basic website level caches.