I am using `selenium-webdriver` to automate web browser related
tasks.But when i did the following getting a chunk of `exception` as
below. Why so,can you tell me?


    irb(main):001:0> require "selenium-webdriver"
    => true
    irb(main):002:0> driver=Selenium::WebDriver.for :firefox
    *** LOG addons.manager: Application has been upgraded
    *** LOG addons.xpi: startup
    *** WARN addons.xpi: Ignoring missing add-on in C:\Program
Files\SearchPredict\P
    RFireFox
    *** WARN addons.xpi: Ignoring missing add-on in C:\Program
Files\SpeedBit Video
    Downloader\SPFireFox
    *** WARN addons.xpi: Ignoring missing add-on in C:\Program Files\Web
Assistant\F
    irefox
    *** WARN addons.xpi: Ignoring missing add-on in C:\Program
Files\Iminent\webboos
    ter / iminent.com
    *** LOG addons.xpi: Skipping unavailable install location
app-system-local
    *** LOG addons.xpi: Skipping unavailable install location
app-system-share
    *** LOG addons.xpi: checkForChanges
    *** LOG addons.xpi-utils: Opening database
    *** LOG addons.xpi-utils: Creating database schema
    *** LOG addons.xpi: New add-on fxdriver / googlecode.com installed in
app-profile
    *** Blocklist::_loadBlocklistFromFile: blocklist is disabled
    *** LOG addons.xpi: New add-on
{F17C1572-C9EC-4e5c-A542-D05CBB5C5A08} installed
    in winreg-app-user
    *** LOG addons.xpi: New add-on ffxtlbr / babylon.com installed in
app-global
    *** WARN addons.xpi: Add-on is invalid: Error: Directory C:\Program
Files\Mozill
    a Firefox\extensions\ffxtlbr / babylon.com does not contain a valid
install manife
    st
    *** WARN addons.xpi: Could not uninstall invalid item from locked
install locati
    on
    *** LOG addons.xpi: New add-on
{1FD91A9C-410C-4090-BBCC-55D3450EF433} installed
    in app-global
    *** LOG addons.xpi: New add-on
{972ce4c6-7e08-4474-a285-3208198ce6fd} installed
    in app-global
    *** LOG addons.xpi: New add-on m3ffxtbr / mywebsearch.com installed in
winreg-app-
    global
    *** LOG addons.xpi: New add-on avg@toolbar installed in
winreg-app-global
    *** LOG addons.xpi: New add-on daplinkchecker / speedbit.com installed
in winreg-a
    pp-global
    *** LOG addons.xpi: New add-on wrc / avast.com installed in
winreg-app-global
    *** LOG addons.xpi: Updating database with changes to installed
add-ons
    *** LOG addons.xpi-utils: Updating add-on states
    *** LOG addons.xpi-utils: Writing add-ons list
    *** LOG addons.manager: shutdown
    *** LOG addons.xpi: shutdown
    *** LOG addons.xpi-utils: shutdown
    *** LOG addons.xpi-utils: Database closed
    *** LOG addons.xpi: startup
    *** WARN addons.xpi: Ignoring missing add-on in C:\Program
Files\SearchPredict\P
    RFireFox
    *** WARN addons.xpi: Ignoring missing add-on in C:\Program
Files\SpeedBit Video
    Downloader\SPFireFox
    *** WARN addons.xpi: Ignoring missing add-on in C:\Program Files\Web
Assistant\F
    irefox
    *** WARN addons.xpi: Ignoring missing add-on in C:\Program
Files\Iminent\webboos
    ter / iminent.com
    *** LOG addons.xpi: Skipping unavailable install location
app-system-local
    *** LOG addons.xpi: Skipping unavailable install location
app-system-share
    *** LOG addons.xpi: checkForChanges
    *** LOG addons.xpi: No changes found
    => #<Selenium::WebDriver::Driver:0x..fbe37f7d8 browser=:firefox>
    irb(main):003:0>

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