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I cannot update the server settings on any account in Thunderbird

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I have Thunderbird 52.7.0 (64-bit). I use a Mac (OS X El Capitan 10.11.6) I cannot update any account settings for any of my accounts. I can input changes to the account settings, but when I click "OK" nothing happens and I cannot navigate away from the dialogue box. The only way to get out is to press "cancel", which means the changes are not saved. What can be done?

I have Thunderbird 52.7.0 (64-bit). I use a Mac (OS X El Capitan 10.11.6) I cannot update any account settings for any of my accounts. I can input changes to the account settings, but when I click "OK" nothing happens and I cannot navigate away from the dialogue box. The only way to get out is to press "cancel", which means the changes are not saved. What can be done?

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Please check to see if prefs.js file is read-only

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I have three on my computer - which one?

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It will be the one in your profile name folder. in Thunderbird Help > TRoubleshooting Information click on 'Open Folder'

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there should be only one prefs.js file Right click on file and select 'Properties' Attributes: Is it 'read only' ? Read only should not be selected.