From https://bugzilla.mozilla.org/show_bug.cgi?id=1251809#c10, > This patch adds support for tooltips on input[type=file] in e10s. I've > updated the automated test to work in both non-e10s and e10s, but was unable > to add test cases for multiple files being selected due to an issue with > MockFilePicker where it only returns the first file from the returnList. > Testing for multiple files will need to be done manually. We can set .returnFiles to an array of size larger than 1, but <input type=file multiple> only gets a .files property of length 1.
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