To achieve that you would need to go on the Confluence admin panel and then global permissions. Add a group in there and only grant the can use permission.
After that go to each space and then click on Space Tools > Permissions. Add the newly created your group in there and only leave the view all option checked.
That should be enough to have a set of users of a specif group to be able to view all pages but not to add comments/create content.
Create a new group, put them in it, go through the spaces and add it to the permissions with only "view" access.
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