- Display a message popup (and wait cursors) while extension manager is starting up to let the users know that they need to wait (helps with making slow startup more tolerable - see Slicer#4806)
- Prevent creating multiple extension manager windows (while the extension manager was starting up, it was possible to create additional instances)
- Display confirmation popup if the user wants to close/restart the extension manager while extensions are still being downloaded or installed
- Make search box work in all tabs
- Make "Install extension from file" more discoverable by having a dedicated button
- Make "Settings" button have the same options, regardless of which tab is selected (it was confusing for users that some options were missing sometimes)
- Fix uninitialized extension manager model (which might have caused crash described in Slicer#4635)

For the future: Extension metadata is queried from the extension server quite extensively. This slows down extension manager startup and filtering and increases load on the server. Performance could be improved by implementing more local caching.

- Display a message popup (and wait cursors) while extension manager is starting up to let the users know that they need to wait (helps with making slow startup more tolerable - see Slicer#4806)
- Prevent creating multiple extension manager windows (while the extension manager was starting up, it was possible to create additional instances)
- Display confirmation popup if the user wants to close/restart the extension manager while extensions are still being downloaded or installed
- Make search box work in all tabs
- Make "Install extension from file" more discoverable by having a dedicated button
- Make "Settings" button have the same options, regardless of which tab is selected (it was confusing for users that some options were missing sometimes)
- Fix uninitialized extension manager model (which might have caused crash described in Slicer#4635)

For the future: Extension metadata is queried from the extension server quite extensively. This slows down extension manager startup and filtering and increases load on the server. Performance could be improved by implementing more local caching.

- Display a message popup (and wait cursors) while extension manager is starting up to let the users know that they need to wait (helps with making slow startup more tolerable - see Slicer#4806)
- Prevent creating multiple extension manager windows (while the extension manager was starting up, it was possible to create additional instances)
- Display confirmation popup if the user wants to close/restart the extension manager while extensions are still being downloaded or installed
- Make search box work in all tabs
- Make "Install extension from file" more discoverable by having a dedicated button
- Make "Settings" button have the same options, regardless of which tab is selected (it was confusing for users that some options were missing sometimes)
- Fix uninitialized extension manager model (which might have caused crash described in Slicer#4635)
- Standardized on naming the component "Extensions manager" (and not "Extension manager")

For the future: Extension metadata is queried from the extension server quite extensively. This slows down extension manager startup and filtering and increases load on the server. Performance could be improved by implementing more local caching.

- Display a message popup (and wait cursors) while extension manager is starting up to let the users know that they need to wait (helps with making slow startup more tolerable - see #4806)
- Prevent creating multiple extension manager windows (while the extension manager was starting up, it was possible to create additional instances)
- Display confirmation popup if the user wants to close/restart the extension manager while extensions are still being downloaded or installed
- Make search box work in all tabs
- Make "Install extension from file" more discoverable by having a dedicated button
- Make "Settings" button have the same options, regardless of which tab is selected (it was confusing for users that some options were missing sometimes)
- Fix uninitialized extension manager model (which might have caused crash described in #4635)
- Standardized on naming the component "Extensions manager" (and not "Extension manager")

For the future: Extension metadata is queried from the extension server quite extensively. This slows down extension manager startup and filtering and increases load on the server. Performance could be improved by implementing more local caching.