osx - Mac: reloading document in Chrome or Firefox? -

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how can tell chrome or firefox reload document in top window? here's i'm using safari:

osascript -e '     tell application "safari"       activate       javascript "history.go(0)" in document 1     end tell '

i not think firefox or chrome have special applescript support, can send keystrokes (cmd-r) refresh page:

tell application "firefox"     activate     tell application "system events" keystroke "r" using command down end tell

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