Firefox Reader View Showing Wrong Author [Bug Fix]

Screenshot of Firefox Reader View Button

Firefox Reader View is a really neat way to consume content on the web — on compatible websites, it extracts the title, author, and main content from the site, and only displays that — leaving out those annoying ads and just about everything else.

Unfortunately, Firefox Reader View doesn’t have good (any?) developer docs, so finding answers to common issues just wasn’t happening for me.  Usually Stack Overflow has the answer — and I did find this helpful answer that explains how Firefox Reader View works, but it didn’t really fix my issue.

The Problem: Incorrect Authors

The Solution: Include an Author Meta tag on your page that looks like this:

<meta name="author" content="John Doe">

For example ^

If you’re using WordPress, you can generate this dynamically as part of your theme code.  It might look something like this:

if ( is_single() ) : ?>
     <meta name="author" content="<?php the_author(); ?>">
<?php endif;

If you’re using the popular CoAuthors Plus plugin for managing multiple authors, you can use the coauthors template function for outputting the author names.

Hope this helps!  This optimization may also help with SEO.  By the way, it looks like when there is no author meta tag, the Firefox Reader View javascript parses the content and looks for an html element with an ‘authors’ class — which in my case, was the direct cause of the incorrect authors showing.

Got any comments on Firefox Reader View or the Author meta tag?  Chime in below.

How to make your plugin have universal settings on Multisite WordPress?

While updating my Check Amazon Links plugin to work with WordPress Multisite, I struggled with how I could make my plugin settings universal across all network installs.  More specifically, I wanted it to be an option that could be turned on and off.  I tried to find a way to implement a hook or filter for when the plugin options were being updated via the settings page, but I had so much trouble with that, that I finally decided to use some Javascript.  Yay for javascript!  Sometimes it’s the easier option.

First, I added the option to my settings page, but only on multisite installs.  Here’s what it looks like:

Multisite Option on my WordPress Plugin (Check Amazon Links)

Next, I wrote the Javascript (jQuery) code to respond to submit events:

jQuery(document).ready(function () {
    var option_page_name = jQuery('input[name=option_page]').val();
    if (typeof(option_page_name) != "undefined") {
        if(option_page_name === 'amazon_link_plugin_options') {
            jQuery('form').submit(function(e) {
                var update_all = jQuery('select[name="azlc_multisite_same[toggle]"]').val();
                if(update_all === '1') {
          , 'action=azlc_ms', function(){});



As you see, my code checks the page name to insure that it only sends the AJAX request if it’s MY plugin’s page.   I add that javascript code to a javascript file I already enqueue.

Here’s the PHP WordPress Backend code for handling the Ajax request:

if(is_multisite()) {
	add_action('wp_ajax_azlc_ms', 'azlc_ms');

function azlc_ms() {
	add_site_option( 'azlc_update_from', get_current_blog_id() );


And here’s the PHP WordPress code the updates the options:

if(is_multisite()) {
	add_action('plugins_loaded', 'azlc_multisite');

function azlc_multisite() {
	global $wpdb;

	// check for flag 
        // I call this a flag because its existence means that this code needs to run.
        // You could write this to make it more human readable
	$blog_id = get_site_option('azlc_update_from');
	if($blog_id) {
		// switch to the blog to copy the actions from
		$options = get_option('azlc_plugin_options');
		// copy settings to all sites
		AmazonLinkCheckerCore::copy_settings_from($blog_id, 'azlc_plugin_options', $options );
		// remove flag
		// switch back


And here’s the code that actually does the copying:

	public static function copy_settings_from($source_id, $option_name, $option_value) {
				global $wpdb;
				$sql = "SELECT blog_id FROM $wpdb->blogs";
				$blog_ids = $wpdb->get_col($sql);
				foreach($blog_ids as $blog_id) {
					// update option on other blogs
					if($blog_id!=$source_id) {
						update_option($option_name, $option_value);


Related Tutorial

Don’t miss this related article: How to Enable WordPress Multisite for your Plugin

Your feedback is important

I write this blog with sincere hope that I can help other WordPress developers.  Please let me know if this helped you, or if I made a bad error.  Thanks!

How to embed C3.js Javascript Charts in WordPress Posts

I’ve been working with C3.js graphs for an admin website and thought it would be fun to use it on this WordPress blog.  You can use most Javascript libraries in WordPress, but it takes a little more work.  If you know how to write Javascript, then you’ll find that C3.js offers a relatively easy way to create custom pie charts, timeseries charts, line and bar graphs, etc.   Here’s an example of a graph created with C3.js.  I used real historical weather data to compare the record high July 2015 temperatures to average temperatures.

Tacoma, WA: Record High July 2015 Temperatures

Here’s how I created the above graph.

First, I downloaded the c3 and d3 libraries (you can get the zip file on github). I unzipped the file and put the c3.css, c3.min.js, d3.min.js files into the root directory of my wordpress theme.

Side note: I am using a child theme, as you should too, to prevent problems if your theme gets automatically updated.  If you are not familiar with child themes, check out this WordPress tutorial.

Next, I added the following code to my functions.php file:


add_action( 'wp_enqueue_scripts', 'add_c3_scripts' );

function add_c3_scripts() {
	$d3_url =  get_stylesheet_directory_uri() . '/d3.min.js';
	$c3_url =  get_stylesheet_directory_uri() . '/c3.min.js';
	$c3_css =  get_stylesheet_directory_uri() . '/c3.css';
	$my_graphs_url =  get_stylesheet_directory_uri() . '/my_graphs.js';
	wp_enqueue_script( 'd3', $d3_url );
	wp_enqueue_script( 'c3', $c3_url, 'd3' );
	wp_enqueue_script( 'my_graphs', $my_graphs_url, 'c3' );
	wp_enqueue_style( 'c3', $c3_css );

Next, I create the my_graphs.js file in the root directory of my theme.  For better organization, you could put this in a scripts folder and change the above url accordingly.

In the my_graphs.js file, I write a Javascript function which creates a C3 chart.  It looks like this:


function july_2015_graph() {
    var chart = c3.generate({
        bindto: '#july_2015_graph',
        color: {
            pattern: ['#396ab1', '#cc2529']
        data: {
            x: 'x',
            columns: [
                ['x', 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ,16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31],
                ['Average', 69, 70, 70, 70, 71, 71, 71, 71, 72, 72, 72, 72, 72, 73, 73, 74, 74, 75, 75, 75, 76, 76, 76, 76, 76, 76, 76, 76, 75, 75, 75]
            type: 'spline'
        axis: {
            x: {
                label: 'Date'
            y: {
                label: 'Temperature (F)',
                min: 65,
                max: 95
        transition: {
            duration: 100

    setTimeout(function () {
            columns: [
                ['2015', 89, 92, 92, 91, 91, 84, 83, 87, 81, 71, 72, 78, 79, 81, 80, 79, 80, 91, 94, 80, 75, 74, 77, 75, 71, 71, 75, 81, 88, 92, 95]
    }, 1000);


The “bindto:” line at the top of that code segment tells the c3.js Javascript Library where to put the graph.

To display the graph in this post, I edit the post in “text” mode (select the text tab at the top of the wordpress post editor) and add this code:

<div id="july_2015_graph"></div>
<script type="text/javascript">


For more information about how to use Javascript with WordPress, check out this page: Using Javascript in WordPress

How to Fix Sidebar Drop Down in WordPress [Visual Tutorial]

A sidebar that drops below the content can be a puzzling problem to fix. In WordPress, you can have sidebars that appear on the left and/or right side of your post content. These sidebars usually hold widgets and are easily customizable. However, sometimes things go wrong with the blog layout and the sidebars will be in the wrong place, or sometimes the sidebars are at the top but the post content has dropped lower.

The problem is usually an HTML or CSS error. The most likely culprit is an extra DIV tag or a missing one. Some blogs have hundreds of DIV tags, so troubleshooting can be a real pain.

This is how I attack such a problem.  Maybe these step-by-step instructions will help you.

First, if you recently installed a WordPress Plugin, try disabling it. If disabling the plugin fixes the problem, then the plugin is the cause. If you want to still use the plugin, you’ll have to edit the code manually.  Wordpress plugins are written in PHP so you’ll need to understand PHP programming to fix the plugin.  If you need help, I’m available for freelance work and I can fix it for you.

If disabling a plugin doesn’t fix your problem, the next step is to look at your blog’s source code.  I like to use the Firefox web browser.  You can try to look at the code with other browsers, but Firefox displays the information in the most user-friendly way.

In Firefox, I right-click on the problematic sidebar and click on “Inspect Element.”

This will show me the source code.  Now, all I do is move my cursor over the different “Div” tags and Firefox tells me exactly what each “Div” tag references.  Here’s a photo to show you what I’m talking about:


Troubleshoot sidebar layout problems with Firefox Inspector
Inspecting a WordPress Blog Source Code in Firefox

See that blue line in the photo above?  My cursor is hovering over that DIV tag.   When I hove over it, Firefox highlights the section of the website in blue that the div is referring to.  It also tells me the CSS class that DIV belongs to, which is .row.column-content-wrapper   That tells me my problem. In many wordpress themes content-wrapper divs are used to hold the content.  There is an extra div that is closing the content too early.  Now I just have to go into the WordPress theme files and remove that div.

How will I know which file to edit?  It depends on the theme and which pages the error occurs on.  In my example case above, my error was only occurring on one post, so the extra DIV was actually in that post. However, if it occurs on most or all of the pages, then it’s probably in a theme page.  If it’s only on single posts, then the error may be in single.php.  If it only occurs on pages and not posts, then the problem may be with page.php.

I hope that helps.  If you think you fixed it, be sure to check out your site on multiple devices to see if it looks correct on your phone, tablet, and desktop.  This issue can happen for mobile users only, or for everyone.  It all depends on your WordPress theme, plugins, and customization.

If you would like expert assistance, I will gladly help.  I have solved problems like this for as low as $15.  Contact me and I’ll be glad to help.