Here are step-by-step instructions for deleting bookmarks from Safari and Firefox. The instructions might vary slightly if you’re using a different version of Safari or Firefox.

If you use Safari 4 or newer

1. Open Safari
2. Go to the Bookmarks menu and select Show All Bookmarks
3. Your current window will change to show your bookmarks. On the left-hand list click on the “Collection” that you want to change. For example, you might click on Bookmark Menu since this is where most people keep bookmarks. Then, on the right-hand side, click on the bookmark that you want to delete.
4. Press the Delete key on your keyboard.

If you use Safari 7 or newer

1. Open Safari
2. Go to the Bookmarks menu and select Edit Bookmarks
3. Your current window will change to show your bookmarks. Click on the bookmark that you want to delete.
4. Press the Delete key on your keyboard.

If you use Firefox 

1. Open Firefox
2. Go to the Bookmarks menu and select Organize Bookmarks. (In newer versions of Firefox select Show All Bookmarks.)
3. A new window will open. On the left-hand list click on Bookmark Menu. Then, on the right-hand side, click on the bookmark that you want to delete.
4. Press the Delete key on your keyboard.