What's the maximum number of previously opened files stored?
There is no limit to the number of previously opened files that Oblivion stores in its list. That's part of the reason why we say that the list that Oblivion handles is a “list of previously opened files” and not a “list of recently opened files”.
Can the extension be disabled?
The extension cannot be disabled. In order to temporarily make it stop to work, users have to uninstall it, which can be done through Tools > Extension Manager. A subsequent reinstallation will make Oblivion resume working where it left. This means that the list of previously opened files as well as the saved search filters will be reinstated, providing that the appropriate files have not been removed or deleted.
Does Oblivion search the contents of files?
No, because the design goal was to allow us to quickly find documents. Although content search is obviously possible, it would have been too time-consuming to develop. Moreover, if the feature were to be implemented, all users would pay the price of a feature that seemed marginally useful in our eyes. Last, there's no shortage of programs that do content search in a much better and more efficient way than Oblivion could in the timeframe we had set.
Is Oblivion compatible with LibreOffice?
No, because Oblivion was developed with the Apache OpenOffice SDK, for AOO. A summary test with LibreOffice 4.2 showed an incompatibility problem when opening up the main dialog window. With time, and if this extension proves to be useful to many, resources will be allocated to handle the LibreOffice compatibility problem, and possibly build a specific extension. The common ancestry between AOO and LO possibly makes the current incompatibility problem trivial but it is probable that both office suites will someday be divergent enough that extensions written for one suite will start to fail irrecoverably on the other suite. When this happens, and if we are still around, please use the Support button and file a request for support.