A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown  at sacred-texts.com
psa 135:1A Psalm of praise, in which God's relations to His Church, His power in the natural world, and in delivering His people, are contrasted with the vanity of idols and idol-worship. (Psa. 135:1-21)
In the general call for praise, the priests, that stand in the house of the Lord, are specially mentioned.
psa 135:4God's choice of Israel is the first reason assigned for rendering praise; the next, His manifested greatness in creation and providence.
psa 135:6heaven, and . . . seas, and all . . . ends of the earth--denote universality.
psa 135:8The last plague [Exo 12:29] is cited to illustrate His "tokens and wonders."
psa 135:10The conquest of Canaan was by God's power, not that of the people.
psa 135:13heritage--or, "possession."
name . . . memorial--Each denote that by which God is made known.
psa 135:14will judge--do justice (Psa 72:2).
repent himself--change His dealings (Psa 90:13).
psa 135:15(Compare Psa 115:4-8).
psa 135:18are like unto them--or, "shall be like," &c. Idolaters become spiritually stupid and perish with their idols (Isa 1:31).
psa 135:19(Compare Psa 115:9-11). There we have "trust" for "bless" here.
psa 135:21out of Zion--(Compare Psa 110:2; Psa 134:3). From the Church, as a center, His praise is diffused throughout the earth.