Update unit test instructions.

See: #483
dteviot · Mar 3, 2021 · d445704 · d445704
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -1,5 +1,5 @@
 ## Pull Request Check List
-* Do all existing unit tests pass?
+* Do all existing unit tests pass?  (FYI, I find it easier to get the unit tests to run under Firefox, instead of Chrome.)
 * Have all warnings and errors reported by eslint been fixed?
 * If you've added new behavior, 
     * Can a user turn it off?  

diff --git a/readme.md b/readme.md
@@ -123,7 +123,11 @@ WebToEpub uses the following libraries:
 ## Other notes
 ### To run unit tests under Chrome
 * Close all running copies of Chrome 
-* Start Chrome with command line argument --allow-file-access-from-files
+* Start Chrome with command line argument --allow-file-access-from-files.  That is:
+    * Open a command propmt
+    * Browse to the directory holding Chrome
+    * Type in command "chrome.exe --allow-file-access-from-files" without the quotes. Press "Enter".
+    * If you don't do this, some tests will fail with error messages containing the text **_Failed to execute 'send' on 'XMLHttpRequest': Failed to load_**.
 * Load unitTest/Tests.html
 * If you get **_Failed to read the 'localStorage' property from 'Window': Access is denied for this document_** errors
     * Type **_chrome://settings/content_** into Chrome's search bar