User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20060518 Minefield/3.0a1 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20060518 Minefield/3.0a1 General | Connection | Connection Settings | Automatic Proxy Configuration URL in the Options should check and warn when a local PAC file specified by file:// doesn't exist. Currently it doesn't say anything and just accepts non-existent file address such as "file:///x:/mypac.pac". I know it's preferable that it doesn't warn anything when a remote address is specified as it may be down and unreachable, but when you select a local PAC file it's a different story. Reproducible: Always
The workaround is to navigate to the file in the browser, then copy the URL of the file (to make sure you got the correct file: URL), then paste it into the URL.
Component: Preferences → Networking
Product: Firefox → Core
QA Contact: preferences → networking
Bulk change to priority: https://bugzilla.mozilla.org/show_bug.cgi?id=1399258
Priority: -- → P5
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