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Firefox & Word Files in Read-only Mode

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This problem has only occurred in the last 24 hours:

a) I access a Word file with Firefox (maybe an e-mail attachment, maybe directly from an e-learning site); I tell Firefox to Open With Word 365; the file opens, but only in Read-only mode - I cannot edit the document at all; I cannot change this status from within Word 365.

b) I access the very same file from the very same source but now tell Firefox to Save File to my Desktop; I then open the file with Word 365 - it opens 'normally'; I can edit the document straight away.

Yesterday, it did not matter if I did a) or b), I could always edit the document straight away (Read-only was never 'forced' on me).

As extra background, I have turned off every Protected View feature in Word 365 which I can find - does not help at all.

I want to be able to go back to option a): Open With Word 365, NOT have 'Read-only' & be able to edit the document immediately.

This problem has only occurred in the last 24 hours: a) I access a Word file with Firefox (maybe an e-mail attachment, maybe directly from an e-learning site); I tell Firefox to Open With Word 365; the file opens, but only in Read-only mode - I cannot edit the document at all; I cannot change this status from within Word 365. b) I access the very same file from the very same source but now tell Firefox to Save File to my Desktop; I then open the file with Word 365 - it opens 'normally'; I can edit the document straight away. Yesterday, it did not matter if I did a) or b), I could always edit the document straight away (Read-only was never 'forced' on me). As extra background, I have turned off every Protected View feature in Word 365 which I can find - does not help at all. I want to be able to go back to option a): Open With Word 365, NOT have 'Read-only' & be able to edit the document immediately.

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Opening the file as read-only is to protect you because when you open a file in another application the file is stored in the OS TEMP folder and can be removed at any time. You need to use "Save As" in Word to save the file in other location (folder) to ensure that you do not lose your edits.

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Dear Cor-el,

Thank you for the timely response - this confirms my suspicions as to why this is the case. Still, I do not understand why, up until 48 hours ago, I could tell Firefox to Open with Word 365, and I would be able to immediately edit the document, and now, just two days later, that is not an option. Moreover, what I would really like to know is if - and how - I can reverse this change. Given the number of documents I process, it would be a minor but noticeable gain in time.

In a nutshell, if I tell Firefox to Open with Word 365, what setting(s) do I need to change so that the document is NOT opened in Read-only? (Given that, if the document is already on my Desktop, this is not an issue, I am assuming - perhaps naively - that the issue is with Firefox and not Word.)

Again, thank you so far.