Firefox 60, 64 bit, can't upload pictures to my forums except in the basic uploader.
Recently, after installing 60, I lost the ability to use an advanced uploader to post forum pictures in vBulletin. I have tried with all add-ons disabled and it is no different. Safe mode works only with the basic uploader. I have reinstalled Firefox 60 and no change. I believe the uploader uses Flash and it is up-to-date. I get an IOerror 2038 when using the advanced uploader on each picture regardless of size or filetype.
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Here is a picture of the forum uploader dialog box and error message. There are 3 pictures selected for upload in the uploader. When the upload button is pressed, each picture file gets an error (!). The number of pictures selected doesn't matter.
There was a change related to Flash in Firefox 60, but it doesn't sound relevant since your screenshot shows an HTTP site: https://www.fxsitecompat.com/en-CA/docs/2018/loading-insecure-content-within-plug-in-embedded-on-secure-site-has-been-deprecated/
If you check Firefox's Browser Console (Ctrl+Shift+j), does it list any additional error messages related to the uploader? After opening the console, click the trash can in the upper left corner to remove clutter before trying the upload.
I realized that I am a member of another forum that uses the same software. So, I went to that forum and was able to upload successfully. I have cleared cookies for the problem site and that did not restore functionality. So, I have a problem report into the site admin so they can check the forum software and settings for an issue. At this point, I believe the problem resides at the site.
Thanks jscher2000! I appreciate your assistance. I get no errors in the console when attempting uploading.