It's not so simple question.
Different extensions contain some number of file types.
Some of old KM extensions are simply km-macros (kmm-files, written on KM's own macrolanguage). Those could be easily used with new KM - just unpack the archive into the KM root folder (these extensions usually have only 'macros' subfolder inside archive).
The same is true for some extensions, which use 3-rd party softwares like some text editors or other small utilities (they are usually placed into 'tools' subfolder, so the archived extension contains subfolders 'macros' and 'tools').
But many extensions do contain chrome-parts, packed into jar-files. Those ones need manual placement in right folders while talking about KM74b4. This place is 'browser' subfolder. But also manifest-file editing is needed.
announced his new assembly where all manifests would be automatically combined into one for KM to read at start. This is made in order to free user from manual manifest editing, which isn't an obvious procedure for novices and unexperienced users.
So just wait till the moment when the KM architecture will be finally settled - only that time we will get easy universal procedure (and may be tools) for KM-extensions installation.
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