Hi, unfortunately the developers of add-ons do not always keep up with Firefox's updates, which may sometimes be because an update has been rushed through for security reasons, as is the case with 39.0.3.

It is worth keeping an eye on any add-ons that are affected, and looking out for updates in due course.

If your question is resolved by this or another answer, please take a minute to let us know. Thank you.

Granted, developers are responsible for keeping track of the Firefox environment, with appropriate help from the Firefox team, itself.

However, my complaint is almost the opposite-- Firefox management should make sure its updates at least accommodate currently installed user Add-Ons, and keep these active through the update process.

If Add-Ons are outdated, of course, the user can take charge, but it is possible to automate even that process. At one point, Firefox updates were much smoother than now, and actually notified users in advance that certain Add-Ons needed to be updated and even helped update the outdated Add-Ons.

In any case, the alternative is chaos-- which is what prevails, now.

As a direct result of its unfocused update Policy, the Mozilla Firefox team should not be surprised to find users do not respond to update notices with the alacrity they should-- all because they are exasperated with Firefox updates which wreck everything.

Specifically, which add-ons were rendered incompatible or are not incompatible with the Firefox 39.0.3 update?

'"Extensions Disabled by the 39.0.3 update--'"

Mozilla Archive Format extension for Firefox (signed) Clean Links (signed) Fire FTP (signed) Session Manager Web of Trust TroubleShooter (signed)

Extensions left active by the 39.0.03 update--

Tree-Style Tab (signed) Open Link in New Tab (signed)

Try to rename (or delete) the compatibility.ini file in the Firefox profile folder to reset the profile.

You can use this button to go to the current Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
• http://kb.mozillazine.org/Profile_folder_-_Firefox

If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.

Checked the FF profile folder, deleted compatibility.ini, and returned to the FF / Tools / Add-ons / Extensions screen to check for updates or any indicators of disabled or incompatible extensions, but found none.

Rebooted FF, found no changes on the Extensions screen, but found a reconstituted compatibility.ini, updated to today (August 8).

Mods, please delete this. Thanks!