View Page does not render in Firefox 52.0.2

When working in the up-to-date version of Firefox and Perch Runway, View Page does not render the page, merely leaves me on the edit page. Everything seems to work fine in Chrome. Has anyone else experienced problems specific to Firefox?

Some of my html files contain an underscore and/or a finishing numeral. Same with some id's. Can this cause a problem?

This is on a dev site, and any number of pages, though not all, present the same problem.

Diaagnostics:

    Perch Runway: 3.0.1, PHP: 5.6.28, MySQL: mysqlnd 5.0.11-dev - 20120503 - $Id: 76b08b24596e12d4553bd41fc93cccd5bac2fe7a $, with PDO
    Server OS: Darwin, apache2handler
    Installed apps: content (3.0.1), assets (3.0.1), categories (3.0.1), perch_blog (5.5), perch_forms (1.9), perch_gallery (2.8.8), perch_shop_orders (1.1), perch_shop_products (1.1), perch_shop (1.1), perch_members (1.6)
    App runtimes: <?php $apps_list = array( 'content', 'categories', 'perch_blog', 'perch_forms', 'perch_gallery', 'perch_members', 'perch_shop' );
    PERCH_LOGINPATH: /perch
    PERCH_PATH: /Applications/MAMP/htdocs/jr_found/perch
    PERCH_CORE: /Applications/MAMP/htdocs/jr_found/perch/core
    PERCH_RESFILEPATH: /Applications/MAMP/htdocs/jr_found/perch/resources
    Image manipulation: GD
    PHP limits: Max upload 32M, Max POST 32M, Memory: 128M, Total max file upload: 32M
    F1: 0c66c2e1f82f9e0b7617b2cb8270f2c7
    Resource folder writeable: Yes
    HTTP_HOST: jr.dev
    DOCUMENT_ROOT: /Applications/MAMP/htdocs/jr_found
    REQUEST_URI: /perch/core/settings/diagnostics/
    SCRIPT_NAME: /perch/core/settings/diagnostics/index.php

Here is a typical template:

<!--Begin grid defined area with horizontal row announce, 1 image, and text-->
<div class="announcegrid announcehorrow1">
      <div class="rowannounce">
        <h2><perch:content type="text" id="rowannouncehor" label="This text is a label for the text and image(s) grouped together" html="true" title="true"/>
        </h2>
      </div>
        <!--Begin written content here-->
        <div class="announcetxt">
          <h2><perch:content type="text" id="announcetxthead" label="Headline for the text area." /></h2>
            <perch:content type="textarea" id="announcetxt" label="Body text to describe this section" size="m" markdown="true" editor="markitup" />
        </div>
        <!--End written content-->      
          <!--Begin single image-->
          <div class="announceimg1"><!--Add detail image-->
              <img  src="<perch:content type="image" id="announceimg1" label="Detail image" />" alt="<perch:content type="text" id="altdetimg1" label="Description" help="alternative description for screen reader etc." title="true" bucket="images" />" />
          </div><!--End single image-->                 
</div>
  <!--End grid defined area with row announce, 1 Image, and text-->

Here is the debug on the edit page having clicked View Page in Firefox- remaining on the edit page:

Debug Message - Perch Runway 3.0.1
[1] SELECT u.*, r.* FROM perch2_users u, perch2_user_roles r WHERE u.roleID=r.roleID AND u.userEnabled=1 AND u.userID=1 AND u.userHash='a43563577b29810e3ca56796ae51d65e' LIMIT 1
UPDATE perch2_users SET userHash='65c73a382f3c9a1b1b0b5740bcb87991' WHERE userID='1'
[77] SELECT p.privKey FROM perch2_user_privileges p
[19] SELECT settingID, settingValue, userID FROM perch2_settings WHERE userID=1 OR userID=0 ORDER BY userID ASC
[13] SELECT itemValue FROM perch2_menu_items WHERE itemType='app'
[1] SELECT * FROM perch2_content_regions WHERE regionID=123 LIMIT 1
UPDATE perch2_content_regions SET regionMultiple='1', regionSearchable='1', regionTemplate='rowannouncehor.html', regionKey='Hor Announce- 1 Label and 1 Image', regionEditRoles='*' WHERE regionID='123'
UPDATE perch2_content_regions SET regionOptions='{\"edit_mode\":\"singlepage\",\"searchURL\":\"\",\"title_delimit\":\"\",\"adminOnly\":0,\"addToTop\":\"0\",\"limit\":\"\",\"column_ids\":[],\"sortOrder\":\"ASC\",\"sortField\":\"\"}' WHERE regionID='123'
[1] SELECT * FROM perch2_content_items c WHERE c.regionID=123 AND c.itemRev=3 ORDER BY c.itemOrder ASC
[1] Using template: /templates/content/rowannouncehor.html
UPDATE perch2_content_regions SET regionHTML='<!--Begin grid defined area with horizontal row announce, 1 image, and text-->\n<div class=\"announcegrid announcehorrow1\">\n <div class=\"rowannounce\">\n <h2>\n </h2>\n </div>\n <!--Begin written content here-->\n <div class=\"announcetxt\">\n <h2>Mosaic for a hearth</h2>\n <p>Body text to describe mosaic</p>\n </div>\n <!--End written content--> \n <!--Begin single image-->\n <div class=\"announceimg1\"><!--Add detail image-->\n <img src=\"/perch/resources/imggold512316.jpg\" alt=\"\" />\n </div><!--End single image--> \n</div>\n <!--End grid defined area with row announce, 1 Image, and text-->\n\n', regionRev='3', regionLatestRev='3' WHERE regionID='123'
[1] SELECT MIN(itemRev) FROM perch2_content_items WHERE regionID=123
DELETE FROM perch2_content_index WHERE regionID=123 AND itemRev<0
[1] SELECT * FROM perch2_content_items WHERE regionID=123 AND itemRev=3 ORDER BY itemOrder ASC
DELETE FROM perch2_content_index WHERE regionID=123 AND itemRev=3
Using template: /templates/content/rowannouncehor.html
INSERT INTO perch2_content_index (itemID, regionID, pageID, itemRev, indexKey, indexValue) VALUES (104,123,36,3,'announcetxthead','Mosaic for a hearth'),(104,123,36,3,'announcetxt','Body text to describe mosaic'),(104,123,36,3,'announceimg1','/perch/resources/imggold512316.jpg'),(104,123,36,3,'altdetimg1',''),(104,123,36,3,'_id',104),(104,123,36,3,'_order','1000')
[1] OPTIMIZE TABLE perch2_content_index
Setting alert: Successfully updated (success)
[2] SELECT * FROM perch2_user_roles ORDER BY roleTitle ASC
[1] SELECT * FROM perch2_menu_items WHERE itemActive=1 AND itemType='menu' AND parentID=0 ORDER BY itemOrder ASC LIMIT 0, 1
[8] SELECT mi.*, p.privKey FROM perch2_menu_items mi LEFT JOIN perch2_user_privileges p ON mi.privID=p.privID WHERE mi.itemActive=1 AND mi.parentID=1 ORDER BY mi.itemOrder ASC
[1] SELECT itemTitle FROM perch2_menu_items WHERE itemType='app' AND itemValue='content' LIMIT 1
[1] SELECT * FROM perch2_menu_items WHERE itemActive=1 AND itemType='menu' AND parentID=0 ORDER BY itemOrder ASC LIMIT 1, 10
[2] SELECT mi.*, p.privKey FROM perch2_menu_items mi LEFT JOIN perch2_user_privileges p ON mi.privID=p.privID WHERE mi.itemActive=1 AND mi.parentID=2 ORDER BY mi.itemOrder ASC
File: /core/apps/content/modes/region.options.post.php
Using template: /templates/content/rowannouncehor.html
Queries: 28
Memory: 5.7188

The template above is one Region in a page, and working from the same Region and going to View Page in Chrome renders the page:

Debug Message - Perch Runway 3.0.1
[1] SELECT * FROM perch2_pages WHERE pagePath='/announcerow.php' LIMIT 1
[14] SELECT regionKey, regionHTML FROM perch2_content_regions WHERE regionPage='/announcerow.php' OR regionPage='*' ORDER BY regionPage DESC