Reload web page(s) and bypass the cache.

• Press and hold Shift and left-click the Reload button.
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Cmd + Shift + R" (MAC)

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

• Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

• Tools > Options > Privacy > Cookies: "Show Cookies"

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration 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

Hi, thank you for the response. I often refresh a page with "Ctrl + F5" but I tried the Safe Mode option and clearing the cache this morning but the behavior is still the same. When I clear the cache for Chrome and IE, the borders are still displaying correctly. I have attached a screen shot of one of the tables. In "A)" I have the normal table and the right border is missing on the 1st column (next to the folder icon) and the very last column. In "B)" I have displayed a hidden table row with JavaScript in the DOM and the borders are then showing. Here is the CSS for the 1st table cell with a folder icon (copied from Firebug):

table#AttrForm thead, table#AttrForm thead th, table#AttrForm tbody, table#AttrForm tbody td {
    -moz-border-bottom-colors: none;
    -moz-border-image: none;
    -moz-border-left-colors: none;
    -moz-border-right-colors: none;
    -moz-border-top-colors: none;
    border-bottom-color: #999999;
    border-bottom-style: solid;
    border-bottom-width: 1px;
    border-left-color-ltr-source: physical;
    border-left-color-rtl-source: physical;
    border-left-color-value: #999999;
    border-left-style-ltr-source: physical;
    border-left-style-rtl-source: physical;
    border-left-style-value: solid;
    border-left-width-ltr-source: physical;
    border-left-width-rtl-source: physical;
    border-left-width-value: 1px;
    border-right-color-ltr-source: physical;
    border-right-color-rtl-source: physical;
    border-right-color-value: #999999;
    border-right-style-ltr-source: physical;
    border-right-style-rtl-source: physical;
    border-right-style-value: solid;
    border-right-width-ltr-source: physical;
    border-right-width-rtl-source: physical;
    border-right-width-value: 1px;
    border-top-color: #999999;
    border-top-style: solid;
    border-top-width: 1px;
}