Make sure that you do not block JavaScript.

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

• https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

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Hi, Thanks for the response. However I tried this and it made no difference. Please suggest something else.

regards

Chris

I see an error in the Tools > Error Console about c[5] is undefined with some of the songs.
It looks that current Firefox versions have a problem with one section of the code.

var re_crd = /([A-Ga-g][#b]?)((maj|[moM])?(sus)?[2-9]?)*(\/([A-Ga-g][#b]?))?/;
.....
c = c.split(re_crd);
if (c[5].length > 0) {

Changing the parse_song() code by adding this test to change the undefined array members to an empty string ("") seems to work.

c = c.split(re_crd);

for (cC=0; cC < 6; cC++) { if (c[cC] == undefined) c[cC]=""; }

if (c[5].length > 0) {

So it looks that the websites need to change that code.
I don't know if this is a bug (regression) or a changed interpretation of parsing rules.