Let's take these one at a time.

(1) Plugin notification

Firefox 30 changed how most plugins work. Instead of allowing sites to use them automatically, Firefox asks you approve sites using them. This doesn't appear in a separate window, but usually appears in a bar that slides down below the address bar. Is that what you're seeing?

If you don't want to decide on a site-by-site basis whether the site can use a plugin, you can switch the setting to "all" or "none". To do that:

Open the Add-ons page using either:

• Ctrl+Shift+a
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Plugins.

Now you can adjust the setting for your plugins from "Ask to Activate" to the desired setting, either "Always Activate" (to let all sites use the plugin) or "Never Activate" (to disable the plugin).

Does that resolve this issue, or are you still getting popups? If you still get popups, could you reply with more detail on what they say?

(2) Yahoo doesn't load completely (3) Facebook doesn't load completely

After changing your plugin settings, is this any better or are these still not loading completely?

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(A) Bypass Firefox's Cache

Use Ctrl+Shift+r to reload the page fresh from the server.

Alternately, you also can clear Firefox's cache completely using:

"3-bar" menu button (or Tools menu) > Options > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now"

If you have a large hard drive, this might take a few minutes.

(B) Remove the site's cookies (save any pending work first). While viewing a page on the site, try either:

• right-click and choose View Page Info > Security > "View Cookies"
• Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies"

In the dialog that opens, you can remove the site's cookies individually.

Then try reloading the page and logging in again. Does that help with the layout problems?

(4) Firefox is freezing

Have you noticed any pattern to where this problem occurs? In some cases, this may be related to Flash videos. If you wait a minute, Firefox may display a dialog indicating that a script is running too long and present the option to Stop or Continue it.

Have you noticed that?

Or can you report any other details about the freezing?