Removed tabindex attributes from comments form

While it's supposed to "improve" the accessibility, it damages it completely when trying to navigate through the site using the keyboard.

comments.php

@@ -82,28 +82,28 @@ The comments page for Bones
 
 		<li>
 			<label for="author"><?php _e( 'Name', 'bonestheme' ); ?> <?php if ($req) _e( '(required)'); ?></label>
-			<input type="text" name="author" id="author" value="<?php echo esc_attr($comment_author); ?>" placeholder="<?php _e( 'Your Name*', 'bonestheme' ); ?>" tabindex="1" <?php if ($req) echo "aria-required='true'"; ?> />
+			<input type="text" name="author" id="author" value="<?php echo esc_attr($comment_author); ?>" placeholder="<?php _e( 'Your Name*', 'bonestheme' ); ?>" <?php if ($req) echo "aria-required='true'"; ?> />
 		</li>
 
 		<li>
 			<label for="email"><?php _e( 'Mail', 'bonestheme' ); ?> <?php if ($req) _e( '(required)'); ?></label>
-			<input type="email" name="email" id="email" value="<?php echo esc_attr($comment_author_email); ?>" placeholder="<?php _e( 'Your E-Mail*', 'bonestheme' ); ?>" tabindex="2" <?php if ($req) echo "aria-required='true'"; ?> />
+			<input type="email" name="email" id="email" value="<?php echo esc_attr($comment_author_email); ?>" placeholder="<?php _e( 'Your E-Mail*', 'bonestheme' ); ?>" <?php if ($req) echo "aria-required='true'"; ?> />
 			<small><?php _e("(will not be published)", 'bonestheme' ); ?></small>
 		</li>
 
 		<li>
 			<label for="url"><?php _e( 'Website', 'bonestheme' ); ?></label>
-			<input type="url" name="url" id="url" value="<?php echo esc_attr($comment_author_url); ?>" placeholder="<?php _e( 'Got a website?', 'bonestheme' ); ?>" tabindex="3" />
+			<input type="url" name="url" id="url" value="<?php echo esc_attr($comment_author_url); ?>" placeholder="<?php _e( 'Got a website?', 'bonestheme' ); ?>" />
 		</li>
 
 	</ul>
 
 	<?php endif; ?>
 
-	<p><textarea name="comment" id="comment" placeholder="<?php _e( 'Your Comment here...', 'bonestheme' ); ?>" tabindex="4"></textarea></p>
+	<p><textarea name="comment" id="comment" placeholder="<?php _e( 'Your Comment here...', 'bonestheme' ); ?>"></textarea></p>
 
 	<p>
-		<input name="submit" type="submit" id="submit" class="button" tabindex="5" value="<?php _e( 'Submit', 'bonestheme' ); ?>" />
+		<input name="submit" type="submit" id="submit" class="button" value="<?php _e( 'Submit', 'bonestheme' ); ?>" />
 		<?php comment_id_fields(); ?>
 	</p>