From the 6.0 release notes: --- Now extension installation and removal via the Extension Manager dialog (Tools ▸ Extension Manager...) can be dynamically enabled/disabled from the expert configurations (Tools ▸ Options ▸ Advanced ▸ Open Expert Configurations). tdf#36019 (Muhammet Kara, Pardus; Heiko Tietze) * This also affects the installation by double-clicking the extension file in the file manager, but doesn't affect the unopkg commands. * When ExtensionSecurity::DisableExtensionRemoval is set in expert configurations, context menu entry of 'remove' for installed extensions is also disabled along with the "Remove" button on the dialog. --- These keys have a 'false' value as default: DisableExtensionInstallation DisableExtensionRemoval After setting them to 'true', an application restart might be needed to make it fully effective.
Olivier Hallot committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/help/commit/6d5b34965b64ed96fb560bdca85dc64088c7f970 tdf#114240 Add note on extension security