I reproduced this bug once in R-B. I couldn't reproduce in Fenix or Focus (GV 68). When I went back to try R-B again, I was no longer able to reproduce it. However, searching for a single letter (like "t") in Fenix and R-B report "-1" hits. Fennec reports "1000+". Focus (GV 68) doesn't report a hit count for single letter searches (seemingly by design), though it does correctly highlight all the letters on the page.
Bug 1568711 Comment 1 Edit History
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I reproduced this bug once in R-B. I couldn't reproduce in Fenix or Focus (GV 68). When I went back to try R-B again, I was no longer able to reproduce it. However, searching for a single letter (like "t") in Fenix and R-B reports "-1" hits. Fennec reports "1000+". Focus (GV 68) doesn't report a hit count for single letter searches (seemingly by design), though it does correctly highlight all the letters on the page.