(1) Set up one-click saving

Instead of having to click a second button to convert an image, you can set up one-click saving in the add-on options -- check out the following screenshot -- by changing the "Plain click" action to whichever quality of JPEG you prefer:

https://addons.mozilla.org/user-media/previews/full/255/255669.png

(2) Where to save (or to always ask)

Add-ons can only auto-save within your default downloads folder. So far, I've created a couple options for how to set up the folder path, which are also in the add-on options. At some point, I do want to add more possibilities there.

Sorry to hear about this problem. You should get a row of buttons overlaid on the image to select your preferred format. If there is a specific site where you noticed this problem, perhaps there is a problem with the positioning (above, below, behind the image?). You can contact me using Github or email (see the links on the lower left side of the main page for the add-on)

(Update: version 1.5.1 pops up a little panel with some more options when the script is denied permission to read the page. Previously that just caused silent failure.).

To change from auto-save to showing the Save As dialog: click the Options (gear) button, and under "Show Save As dialog each time" click the Yes bubble.

Could you let me know the site where you don't get a useful file name? I'm not sure the add-on can detect the intended name, but I can take a look. (You can contact me at jscher2000@outlook.com or using the Support link on the main page.) You also could try using the IE11 button in those cases -- it doesn't change the format, but modifies the request to the server to try to get whatever format they offer to older browsers.

Hi Matchbook, does the add-on menu item appear when you right-click on an image?

If not:

One possible reason is that it is a background image behind another element; currently, the extension does not detect those. Select Open Image in New Tab first and then right-click the image in the new tab (stand-alone image viewer). Another possible issue is not be enabled to run in private windows. More info on that in the following article: https://support.mozilla.org/kb/extensions-private-browsing

Next question: do the save buttons appear overlaid on the image after you select the right-click context menu item?

If not:

You can contact me for assistance using the Email link on the main page or the Issues tab on Github (add-on Homepage link).