(A) seach only page TITLE
This addon can seach title only by option.
check "TITLE or URL" from "BODY"
(If it is invisible , click "( + detail ) " near searchbox)

(B) only hit "car" not "instacart"
How about use "regular expression"?

Example for this case
1. Check " SearchType : Regular Expression " to on.
(If it is invisible , click "( + detail ) " near searchbox)
2. Replace search word to "\bcar\b" .
(\b means word separation)

see also
(english version)
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
(nihongo 日本語 version)
https://developer.mozilla.org/ja/docs/Web/JavaScript/Guide/Regular_Expressions