https://www.lifewire.com/firefox-built-in-email-masking-7963129
Firefox Relay is bringing its email masking and protections to all Firefox Account users with direct browser integration.
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A place to discuss the news and latest developments on the open-source browser Firefox
Titles of books, movies, and other works; names of periodicals and magazines; chapter headings; and titles of articles and blog posts are usually capitalized using title case. Sentence-case capitalization is used for second-level headings and lower.
News headlines have traditionally been capitalized using title case, although these days, sentence case is often used, especially online.
From here. Seems like title case or sentence case is fine and both are used.