Hugo server serves old files

The hugo server command serves me old files that were in my project folder. In particular, I have a layouts/_default/list.html template, whose content is only I'm the list template. After I delete this file, running hugo server again shows me I'm the list template again. I at first thought it was a cache problem, then I deleted it and the problem disappeared, but this didn’t work a second time. I’m using Mozilla Firefox last version. Using Safari the problem doesn’t occur. Do you know which could be the cause of the error using Firefox?

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Try a different browser. If the file doesn’t show up, it’s browser cache.

You’re right, I’m sorry. I edited the question.