Currently, there is next to nothing on-line on my own ancestors except what I've published myself. So, research these days is on collateral lines and modern descendants.
For on-line work, I have bookmarked websites and collections that I use frequently. I play the various searches to find records.
I have an ancestry account, but don't keep my subscription active continously. During lapses, I bookmark search results and to-do items in zotero for later follow-up.
One of my wish items for ancestry is sortable results tables. Often, I need to copy and paste to a spreadsheet to sort and/or filter.