Given this same query works just fine on ecosia with Bing selected as the results provider (https://www.ecosia.org/search?q=%22%7E%2FLibrary%2FApplication+Suppo

Given this same query works just fine on ecosia with Bing selected as the results provider (https://www.ecosia.org/search?q=%22%7E%2FLibrary%2FApplication+Support%2FMozilla%22 https://www.ecosia.org/search?q=%22%7E%2FLibrary%2FApplicati...), DDG is probably messing the API request to Bing. They state they have an advanced ~ operator: https://duckduckgo.com/duckduckgo-help-pages/results/syntax https://duckduckgo.com/duckduckgo-help-pages/results/syntax Probably mangling the query somehow.