Use Chrome in tests instead of Firefox

Firefox keeps breaking Selenium support

tests/WebSpec.hs

@@ -43,7 +43,7 @@ tests = run $ do
   markdownTests
 
 mainPageTests :: Spec
-mainPageTests = session "main page" $ using Firefox $ do
+mainPageTests = session "main page" $ using Chrome $ do
   openGuide "/"
   wd "is initially empty" $ do
     checkPresent "#categories"
@@ -76,7 +76,7 @@ mainPageTests = session "main page" $ using Firefox $ do
       height2 `shouldBeInRange` (90, 140)
 
 categoryTests :: Spec
-categoryTests = session "categories" $ using Firefox $ do
+categoryTests = session "categories" $ using Chrome $ do
   openGuide "/"
   wd "add a new category" $ do
     createCategory "Some category"
@@ -242,7 +242,7 @@ categoryTests = session "categories" $ using Firefox $ do
       "body" `shouldHaveText` "Something went wrong"
 
 itemTests :: Spec
-itemTests = session "items" $ using Firefox $ do
+itemTests = session "items" $ using Chrome $ do
   openGuide "/"
   wd "create a test category" $ do
     createCategory "Item test category"
@@ -425,7 +425,7 @@ itemTests = session "items" $ using Firefox $ do
 -- TODO: merge tests
 
 markdownTests :: Spec
-markdownTests = session "markdown" $ using Firefox $ do
+markdownTests = session "markdown" $ using Chrome $ do
   openGuide "/"
   describe "Markdown isn't allowed in category names" $ do
     wd "when creating a category" $ do
@@ -614,7 +614,7 @@ run ts = do
 
 _site :: IO ()
 _site = run $ do
-  session "_" $ using Firefox $ do
+  session "_" $ using Chrome $ do
     wd "_" $ do
       openGuidePage "/"
       _pause