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+Rather than make changes to the built files here, make them upstream and then
+upgrade our tree's copy of the built files.
+
+To upgrade the source-map library:
+
+ $ git clone https://github.com/mozilla/source-map.git
+ $ cd source-map
+ $ git checkout <latest-tagged-version>
+ $ npm install
+ $ npm run-script build -or- nodejs Makefile.dryice.js (if you have issues with npm)
+ $ cp dist/source-map.js /path/to/mozilla-central/devtools/shared/sourcemap/source-map.js
+ $ cp dist/test/* /path/to/mozilla-central/devtools/shared/sourcemap/tests/unit/
+