Truth be told, it could be easier to save images from the webOS browser. You can’t tap and hold, you can’t get any options in the edit menu, people have gone so far as to propose taking screenshots instead of saving the actual image.
There’s a better way:
1. Press and hold the “Option Key” (rectangular symbol under the “A” key) and tap on the image in the browser that you want to save.
2. Select “Copy to Photos”
Simple to do, not so simple to figure out the first time… anyway, that’s it.