Only partially working on TB v16 Rated 3 out of 5 stars
Thunderbrowse will open some links via left- or middle-click, but other links it simply seems to not detect that they are in-fact links. However, if you press the "new thunderbrowse tab" button, you will see a new thunderbrowse tab with a url-bar. From there you can copy and paste a link that wasn't earlier working in TB... into the url bar, and now that link will show in thunderbrowse. So the problem seems to simply be with link detection.
2 other suggestions:
1) Enable option to open a new thunderBIRD tab... that has no message content, only thunderbrowse content. Currently, if you have multiple thunderbrowse tabs open, you CAN'T close the original message-tab.
2) Utilize the above method to have thunderBIRD tab A) open with 5 thunderBROWSE google tabs or such, then open a completely new thunderBIRD tab B) that has maybe 5 thunderBROWSE yahoo tabs open. This is just one suggestion to deal with a lack of multi-row tabbar and tab-groups... both of which expand tab-space in their own way.