Known issues: Firefox

Missing upload link when using the latest version of Firefox (49.0.2)

There is a change in the latest version of Firefox (49.0.2) that causes the upload link to disappear if you have the flash uploader enabled.

Asynchronous rendering of the Flash plugins is now enabled by default. This is causing problems with "broken content including video players and games".
https://www.fxsitecompat.com/en-CA/docs/2016/some-flash-content-is-broken-due-to-async-rendering-mode/

The article also has an update to suggest that asynchronous rendering will be disabled in the next version of Firefox and has been already for the Firefox 50 Beta.

Here are some options while the Firefox issue is sorted out to show the upload link in CMS Builder:

1. Disable the flash uploader in CMS Builder. This will still allow uploads but only one at a time.

In CMS Builder go to Admin > General Settings, then scroll down to Advanced Settings part of the page.
Check the File Uploads checkbox to "Disable Flash Uploader - attach one file at a time (doesn't require flash)" and click the Save button.

2. Have users use an alternate browser to Firefox: 
Chrome, MS Edge, Safari, Opera

3. Change settings in Firefox:

Enter this is the browser address bar:
about:config

Search for dom.ipc.plugins.asyncdrawing.enabled

Toggle the Value from True to False

We will keep watching for updates from Firefox and post again when that is available.

Thanks!